When a new string of murders perfectly mirrors the signature of a serial killer who died in the '80s, investigators are stunned to find a thirty-five-year-old man who looks exactly like the long-dead butcher. He refuses to speak, offers no explanation, and the detectives call in Dr. Emily Beckett to break through his silence.

Emily craves answers. But as she digs into his fractured psyche, the line between doctor and patient blurs. What she believes is progress is just his influence sinking deeper into her own wounds. Her trauma tells her a monster like him might still be capable of loving someone like her.

She thinks she's close to the truth behind the killings, but she couldn't be further from it.

Zayne Mercer was never acting alone.

He is one of two twins made in the lab of the Halden Institute. And when he finally escapes and reunites with his brother, Emily learns the hardest

Some monsters are born.

Some are made.

And some… are loved.