Her name was written in blood. The killer wears her face.

FBI Agent Wren Cade has spent a lifetime building walls to keep the darkness at bay. She relies on strict rules and rehearsed scripts to navigate a world she doesn't quite understand. But when her therapist is found brutally murdered with a message left specifically for Wren, those walls begin to crumble.

The killer isn't a stranger. She is the only person who knows the architecture of Wren's nightmares because she shares them. Lark Cade -- Wren's psychopathic twin sister -- has escaped custody, and she's ready for a family reunion.

Lark doesn't just want to kill; she wants to dismantle Wren's life piece by piece. Turning the Pacific Northwest into a chessboard, Lark kidnaps Wren's best friend and baits a trap that forces Wren to confront a terrifying question: Is she truly the sheepdog protecting the flock, or just a wolf in a collar?

From the silence of a crime scene to the roaring spillway of a hydroelectric dam, Wren must hunt the one predator who can predict her every move. To save the people she loves, Wren may have to break her own rules -- and unleash the monster she's spent a lifetime suppressing.

The final game has begun, and only one sister can walk away.

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• Mystery, Thriller & SuspenseCrime FictionSerial Killers

• Publication Date: February 5, 2026
• Text-to-Speech: Disabled
• Lending: Disabled
• Print Length: 296 Pages
• File Size: 704 KB