THE MAFIA BOSS NOTICED BLOOD ON HIS MAID'S BANDAGE, BUT WHEN HE ASKED WHO WAS RESPONSIBLE, SHE BEGGED HIM NOT TO SAY ANOTHER WORD.

Theo wanted to call the police. I wanted him to call every police department between New York City and Albany. Ronan wanted to know why his dead sister's warning had survived fifteen years without anyone in the house finding it.

“Because it wasn't meant to be found by anyone who didn't know where to look,” I said.

Theo sat back from his computer. “That's not an answer to why we aren't driving straight to the sheriff.”

Ronan held up the tiny memory card. “This proves my father knew about a spill. It doesn't prove where Sofia is. If Celeste learns what we found, she can move her before anyone gets a warrant.”

“And if she learns we've found it because we spend all night running through secret tunnels,” Theo replied, “we'll have accomplished the same thing with worse shoes.”

He had a point. I almost liked him for saying it.

Ronan studied the blueprint. “There's an inspection alcove halfway along the passage. It isn't marked on the public restoration plans. We can check it without opening the river gate.”

“Who is we?” Theo asked.

“You and I.”

“And Elena,” I said.

“No.” Ronan's answer came too fast.

I stood. “My sister has been missing for six weeks. I've cleaned blood-colored marks out of your floors, lied to a man who hurt me, and listened to her beg me for help through a fountain. You don't get to put me in a corner because you suddenly feel responsible.”

His eyes met mine. The hard blue-gray stare everyone feared held something different now: shame. After a long moment, he folded the blueprint and handed it to me.

“Then you stay where I can see you,” he said.

“Same goes for you.”

We left through the bookcase door and followed an old stairwell beneath the east wing. Theo carried a flashlight and complained under his breath about centuries of dangerous architecture. The deeper we went, the colder the air became. The house's polished perfection vanished, replaced by peeling paint, damp stone, and rusted pipes. It felt as though we'd stepped underneath a beautiful photograph and found the nails holding it up.

At the bottom of the stairs, a steel hatch stood ajar.

“That should be locked,” Ronan said.

I touched the edge. Fresh scratches circled the bolt. “Someone opened it recently.”

Theo aimed his flashlight into the darkness. “Good. Nothing says promising evening like a tampered-with underground entrance.”

We crossed into a low passage where water dripped through the ceiling. A narrow channel ran beside our feet. Every few yards a light bulb flickered behind wire mesh. Whoever had restored the main house had left this place to rot, but the floor showed clear signs of use: muddy boot prints, a wheel track, and a torn strip of blue packing tape.

I picked up the tape. Sofia used the same shade to label archive boxes. My throat tightened at the thought that she might have walked this way.

Ronan stopped at a side door with no handle, only a square keyhole. “The inspection room.”

Theo crouched by the lock. “Do you have the key?”

“No.”

“Then I have a legally uncomplicated solution. We turn around.”

I touched the stone beside the frame. There were three shallow grooves in the mortar, almost invisible beneath the damp. At the bottom, someone had scratched a circle with a broken edge.

“Wait,” I said. “Mara's mark.”

Ronan ran his fingertips over it. “She must have been down here.”

“Or Sofia copied it.” I moved a loose stone with the toe of my shoe. Behind it was a narrow recess. Inside lay a brass key wrapped in clear plastic.

Theo raised both hands. “For the record, I love competent women. They make my job look unnecessary.”

The key turned slowly. Ronan opened the door and shone his flashlight inside.

There were no windows. The walls were covered in pale tile that had once been white. A folding cot stood in the corner beside a plastic water jug. Food wrappers lay beneath it. A blanket had been tucked into a neat square, and next to the cot sat a pair of women's sneakers, size seven.

Mine was seven. Sofia's too.

I crossed the room in three strides. A broken red hair tie hung from a nail above the cot. Sofia wore red ties even though she lost them constantly. She always said they were easier to find on the bathroom floor.

“This is hers,” I said.

Ronan took a careful look around without touching anything. “Maybe. Don't disturb it. We need photographs.”

Theo began taking pictures while I searched the walls for a message. The room smelled faintly of bleach and river mud. There were no clocks, no windows, nothing to tell a person how long they'd been held. Only a narrow vent above the door, too small for anyone to crawl through.

On the underside of the cot, carved into the metal, were four words.

I AM STILL HERE.

I sank to my knees. Sofia had written them the way she wrote grocery notes, stretching the tail of the last letter. I put one shaking hand over the words without touching the metal.

“She was alive in this room,” I said.

Ronan knelt beside me. “Elena.”

“Don't tell me to calm down.”

“I wasn't going to.”

His answer nearly undid me. I pressed my lips together, concentrating on the cold floor beneath my knees until I could breathe again.

Theo's flashlight moved across the far wall. “Guys? You need to see this.”

He peeled back a paper notice about fire safety. Behind it, written in pencil on the tile, was a series of dates. The most recent was from yesterday. Beside it were small marks: one, two, three, a circle.

“A count,” I whispered.

“Of what?” Theo asked.

“Deliveries. Sofia labels everything in groups.” I counted the marks. “Three yesterday. Four the day before. She was tracking something.”

Ronan pointed to a faded arrow at the bottom. It pointed toward the north wall. “What's on the other side?”

Theo checked the blueprint. “Service channel leading toward the pumping station. According to this, it's sealed.”

We heard a low rumble through the tiles. Water stirred in the drainage channel outside. A mechanical gate was moving somewhere beyond the wall.

Then, very distinctly, a man shouted.

I shot to my feet. “Sofia?”

“That was a man,” Ronan said. “Stay back.”

He stepped into the passage, and Theo followed with his phone light raised. I lingered just long enough to notice the blanket wasn't folded at random. Its corner had been tucked beneath itself, forming a small triangle. Sofia did that when she packed fragile documents. Inside the fold was a strip of paper cut from an invoice.

WESTBANK SERVICES — TEMPORARY TRANSFER / AUTHORIZED BY C.M.

Below it she had written: NORTH STAR IS A PERSON, NOT A PLACE.

I slid the paper into my pocket, then hurried after the men.

They had reached a junction where the channel plunged beneath an iron grate. On the far side of the grate stood Malcolm Pryce, illuminated by a maintenance lamp. He was speaking to someone we couldn't see.

“Move it before dawn,” he said. “The boss has figured out too much.”

The other person answered too softly to hear.

Malcolm swore. “I don't care if she can walk. Carry her.”

I took a step forward. Ronan caught my sleeve, careful not to touch my injured wrist. He held a finger to his lips. A moment later Malcolm turned sharply, as if he'd heard us, and pointed a flashlight into the darkness.

We pressed ourselves against the wet wall. The beam moved past my shoes, across Ronan's coat, and stopped just short of Theo's glasses. I could hear my own pulse.

“Who's there?” Malcolm called.

Water rushed through the channel. A pipe shuddered overhead. Ronan reached into his coat, but I caught his hand and shook my head. We could not fight our way through a tunnel without knowing who waited behind Malcolm.

Another voice called from beyond the gate. “We've got five minutes.”

Malcolm cursed again and went away. We stood motionless until his footsteps disappeared.

Theo breathed out. “I'm officially voting for daylight and witnesses.”

Ronan's gaze stayed on the grate. “He said carry her.”

“Then she's alive,” I said.

“It means somebody is alive.” His honesty stung, but I knew he was right.

On our way back, Ronan stopped beside an old wall plaque. It bore the crest of the Vale family above the inscription: BUILT TO ENDURE. A newer steel plate had been screwed over the lower half. He removed it with Theo's pocket tool. Beneath lay a narrow brass cylinder packed into a recess.

Inside the cylinder was a second key and a letter wrapped in oilcloth. The paper was yellow with age. Ronan unfolded it under his flashlight.

It was addressed to him.

Ronnie,

If you are reading this, I was right to be scared. Dad keeps saying the Westbank men knew the risks. I heard him tell Celeste to find Daniel before he reaches the river. I wanted you to believe me, but you always thought I was making trouble. There is a door behind the pump controls. Daniel says it leads to a room they don't want anyone to see. If I can't tell you myself, follow the water. Please don't make the mistake of trusting someone just because she knows how to sound kind.

Love,

Mara

Ronan read the letter without speaking. The flashlight trembled in his hand.

“Celeste worked for your father then?” I asked gently.

“She was his assistant. Twenty-two. I thought she was the only adult in that house who listened when Mara talked.”

Theo looked at the letter. “We have more than enough to bring in an independent investigator.”

Ronan nodded, but he kept staring at the word kindly, as if it had turned sharp.

We returned to the library just before midnight. Theo locked the archive photographs onto two separate encrypted drives while Ronan tried a number he hadn't dialed in years: Detective Naomi Reyes, now with the state criminal investigations division. She had investigated Mara's death as a young patrol officer and raised questions nobody wanted answered.

The call went to voicemail. Ronan left one sentence: “I found something Mara wanted you to see. Call me on my personal line.”

The house beyond the walls remained silent. I was pouring water into a glass when Ronan's phone lit up with a text from an unknown number.

A photograph filled the screen.

Sofia sat in a metal chair under a fluorescent light, pale but unmistakably alive. Someone had put a newspaper dated today on her lap. Her eyes were open. One hand was closed around a scrap of cloth.

Beneath the photograph was a message:

YOU HAVE SIX HOURS. BRING THE LETTER TO THE NORTH GATE. COME ALONE.