Isabel Raine thought she had everything. A successful career, a supportive family, and a happy marriage to the man she loved. Then one ordinary morning, her husband, Marcus, picked up his briefcase, kissed her goodbye, and simply vanished.

That day all her calls went straight to voicemail; the messages she left at his office went unreturned too. Panicking after finally receiving a call from his cell phone in which all she could hear was a man’s terrified cry, Isabel called the police. But they weren’t interested. Men leave, they told her. They leave all the time. Desperate to find her husband, Isabel raced to his office. But instead of finding him, she finds herself in the middle of an FBI raid. Hours later, she awakens in the hospital with a severe concussion and a homicide detective by her bedside waiting to question her about Marcus Raine — the real Marcus Raine.  

Now the only thing Isabel knows for sure is that her husband of five years is gone. Where is he—who is he—are questions no one seems to be able to answer. But Isabel will not rest until she finds the truth about the man she loves, even if it means risking everything—including her own life. 

Bestselling author Lisa Unger takes us on a nightmarish journey from bustling, glamorous New York City to the murky, twisted streets of Prague, seeking the answer to one bone-chilling question: What if the man you love, the one sleeping beside you, is a stranger?