Collins Blackmon is three weeks from testifying against the man charged with murdering her mother and twin sister—testimony she has rehearsed, sworn to, and invented. She survived that night but remembers none of it. Still, she has no doubt her ex-boyfriend Spencer did it. The police reconstructed it for her. All she has to do is call it memory.

As she waits for the trial with her father, snowbound in the mountain cabin her mother spent nearly thirty years locked inside, Collins finally opens an unread email from the night of the attack: You have new DNA relatives. Her closest match is her twin. But according to the site, Camden is her half-sister, with only 25.4% of their DNA shared.

The discovery leads Collins back to her mother’s past, to 1997, the year she was conceived, the same year Jaclyn was being stalked by a serial predator the papers dubbed The Silencer. It was never solved. If the case and the mystery of her DNA are connected, so is she, and everything the police believe happened the night her family was attacked may be wrong, including the man she’s about to lie on the stand to convict.

The one thing both cases share is the man now sleeping down the hall, the one she has called Dad her whole life. And as the evidence begins pointing at him, Collins realizes she’s weeks away from sending an innocent man to prison while the real killer may be waiting out the trial under the same roof. If he realizes what she’s uncovered, she’s no longer the survivor who remembers nothing.

She's the last witness left to silence.