Chapter 2: Traces of Star Salt

And in the process, he would show his hand.

I pressed the emergency number and gave the coordinates of the old Tempelhof Airport base, then reported the underground tunnel, the deceased, and the suspected biological samples. The dispatcher asked me to confirm my name. I gave Wilhelm Vogt, head chef, witness on scene. Ulrich Hartmann stood by the door, wiping the sweat from his brow with the back of his hand, eyes fixed on the officer at the end of the corridor.

"Put radiation leak in the report, or the police won't mobilize a containment force—they'll just treat this as a prank," I said.

Ulrich hooked the door chain, and the metal plate clinked sharply: "You want to use a scare word to hold the police back and buy Otto Frank reaction time. That move is going to cut us first."

"Better cut than buried in concrete." I looked at the fresh crack in the floor. "If they get here first, the crystals disappear and the deceased becomes a nameless corpse."

Twenty minutes later, two patrol cars pulled up beside the old airport runway. Berlin's night wind cut through the broken glass of the terminal, swept up scraps of paper, and slapped them against the officers' trouser cuffs. The lead officer checked my ID, then looked at the private investigator's license Ulrich handed over, and finally turned to the sealed underground entrance.

"You reported unidentified radiation, but there are no instrument readings on site and no burn victims. Who taught you to call in a charge like that?" the officer asked.

"I reported a suspected hazardous material and requested forensic protection of the scene," I said. "Whether it constitutes a radiation incident is for you to determine after testing. There's crystal residue beside the body. Contact could have unknown consequences."

The officer opened his notebook. "The deceased is unidentified, the entrance is sealed with concrete, and there are no blast marks in the vicinity. You two trespassed into a restricted area—and did you remove anything?"

"Nothing." Ulrich spread his hands. "The box is still where it was. Anyone who wants a look can put on gloves and go in—just don't crush the evidence under your shoe soles."

Two officers circled to the back of the old warehouse and found the iron box we'd described. A crack ran along the lid, and inside was a layer of grayish-white crystal, like coarse salt crusted along a stone trough in winter. The forensic examiner hadn't arrived yet. The officer pulled on a disposable glove, shone his flashlight inside, then shut the lid.

"This is your dangerous sample?" He frowned. "Looks like kitchen salt. Berlin's pranksters have started hiring chefs as consultants."

"Ordinary salt grains slump at the edges once they absorb moisture, and the crystal faces go cloudy." I crouched and studied the bottom of the box through the clear evidence bag. "These crystals keep right-angled edges and a waxy luster on the surface. They went through low-temperature drying, then briefly took on water."

The officer clipped the pen between his fingers. "You're a head chef, not a chemical examiner. Please don't pass off kitchen judgments as forensic conclusions."

"I'm only describing how it was stored. I'm not writing a report for the medical examiner." I answered. "That brown film on the bottom of the box carries a fermented smell—like the acid salts left after lactic fermentation. It's clinging between the crystals, which means the crystals were used as a culture medium."

Ulrich stepped forward. "Seal the box, photograph it, log everyone who goes in and out. If you keep treating this as a joke, someone will walk off with the real evidence tomorrow."

The officer's phone rang. He listened for a few seconds, his face darkening, then signaled his colleague to seal off the warehouse. The forensic van finally rolled onto the runway, blue lights washing the walls like cold water repeatedly sluicing old brick. Sample bags, numbered tags, and cameras were laid out on a folding table. The examiner tweezed out a few crystals with forceps, dropped them into a sealed tube, and pulled a flattened clear vial from the dead man's coat pocket.

Only half the vial's label remained, black letters smeared with mud. My fingers hovered in the air through the glove, and that familiar sourness in my stomach suddenly surged. I'd seen this kind of vial before. In the old recipe book my father left behind, one page had been half-sliced away with a knife—and the corner still clung to the same clear film.

"Does this vial come from a food lab?" the examiner asked.

"The body's from a kitchen. The cap's from a sampling container meant for travel," I said. "Someone fitted two parts together. It's held salt-water ferment, and it's held active samples that needed to be sealed off from air."

The officer looked up. "What kind of experiments did your father do? Be clear—don't put family rumors into a police record."

"He ran a small restaurant, and he kept fermentation cultures for a group of people who didn't want their names on anything." I stared at the bottom of the vial. "The old recipe book says this medium is never to be made public. If the formula falls into a stranger's hands, ordinary fermentation turns into uncontrolled contamination."

"Did you know the deceased?" Ulrich asked.

I shook my head. "Never seen his face. But he kept that vial on his body, which means he knew what it was for—and he knew someone would come after it."

At one in the morning, Greta Ostermann arrived at the scene. She wore a dark coat and carried an archive box, her shoe soles crusted with wet sand. She looked at the evidence bags first, then the old entrance, and finally took out a magnifying glass. When the officer handed her the sample tube, she didn't take it right away—she asked to see the scene photos, the seal times, and the position of the box bottom.

"I can determine whether the striations match archive markings, but I cannot confirm crystal composition for the police," Greta said. "Please preserve the original photographs. Any cropping destroys the basis for comparison."

The officer handed her the tablet. "Ms. Ostermann, why would the archive get involved in a case about an underground warehouse? What is your relationship to Wilhelm Vogt?"

"I'm an archivist at Humboldt University." She flipped through the photos. "Wilhelm holds culinary records from an old family case. I identify historical documents. Only when two lines of evidence meet is it worth pursuing further."

I pulled up the photo of my father's recipe book and zoomed in on one line. The ink had faded to brown, and only three words remained of the ingredients: coarse salt, malt water, Star Salt. I'd always taken the last two as codes an old man had made up. The moment Greta saw "Star Salt," she snapped the archive box shut.

"Wilhelm, tell me the recipe as you remember it," she said. "Miss one step, and the conclusion could drift from the entire chain of evidence."

"The salt crystals are first dried at low temperature, then soaked in malt-bearing water, then returned to a sealed clay jar," I said. "Ordinary cultures spoil within three days. Star Salt keeps its hardness. My father wrote one line: only to be used to feed things that come from far away."

Greta put on the magnifying glass and picked up a single crystal. Faint grooves ran across its face, as fine as needle scratches on glass. She rotated the evidence bag so the light raked across it from the side. The lines ran in segments—triangles, short dashes, and two notches.

"These aren't cracks from crystallization," she said. "This is artificial micro-engraving. The triangle marks a cargo hold, the dash marks a refrigerated compartment, and the two notches mark the sample's origin."

I set the crystal back on the cushion paper and pressed the bag shut through the glove. "The Star Salt in the old recipe book has triangle marks too. Father never wrote an explanation—he just drew a ship without sails beside it."

"Are there transport records in your family archive?" Greta asked.

"A few old railway freight bills, dated from before the mark switched to the euro." I said. "The sender always used the same initials, but the destination was scraped off. Just before he died, my father told me only one thing: don't let that batch of salt come back to Berlin."

That was when Hildegard Dressler appeared. She wasn't in uniform—just carrying an old leather bag. She stood outside the police tape, showed her ID to the officer, and handed Greta a route map folded soft and white. The paper showed Berlin's old railway freight lines, with a branch near Tempelhof circled in black ink.

"I worked thirty years for the railway company. I've seen the seals on this batch of crates," Hildegard said. "They went from the old airport freight station to Friedrichshain, then on to a location that couldn't be written on any bill of lading."

Ulrich blocked her way. "You knew there was something underground. Why come forward only now?"

"Because someone went through the old files tonight." Hildegard lifted her leather bag. "I received an unsigned photograph. This iron box was in it. On the back: 'The courier has been recovered.'"

The officer took the photo. "Who can prove this isn't a forgery?"

"The paper comes from the railway company archive. The photo's corner carries an old scan number," Greta said. "I can trace the number, but I need the police to formally request the archive. If someone deleted records, the deletion traces will remain too."

I looked at the two notches on the crystal, and the sail-less ship from my father's recipe book surfaced in my mind. It wasn't a ship. It was the side-view marking of a mothership. Star Salt preserved samples for long journeys; the fermentation liquid kept them alive through the transit. My father had hidden the true purpose behind kitchen terms—and the family had carried the stigma of selling contraband ever since.

"Where do your so-called samples come from?" the officer asked.

"From a missing deep-space mothership." I said. "Its cargo markings are on the crystal. The name is the Icarus. It went missing in 2018."

The officer set down his pen. "A deep-space mothership? You want me to write that into a Berlin police file?"

Greta handed him an enlarged photo of the striations. "Write the cargo marking first, then the ship's name. The archive number, the line arrangement, the seal location—all verifiable. Absurdity is no substitute for verification, and neither is it a substitute for evidence."

"Who was the Icarus's ground contact in 2018?" I asked.

Greta opened the archive box and drew out a thin registration sheet. Water stains marked the paper's edge, and a red stamp from the Humboldt University old archive room sat in the upper right corner. She read halfway, and her finger stopped on a name column circled in pencil.

"The ground contact was a single person," she said. "The registry shows that in his last contact before the disappearance, he reported an anomaly in the cargo hold seals."

Ulrich took the sheet, his eyes on the warehouse where the body lay. "The name? Don't let another anonymous entry bury a life that was actually lived."

Greta raised her face and turned the sheet over. A scene photo was pasted to the back—the dead man's collar, the old scar on his left hand, the flattened bottle cap on his chest—all matching the description in the file.

"This body has been identified," she said. "The deceased is the last ground contact of the Icarus before it disappeared."