A blood-chilling new thriller from the author of The Second Wife: Twin sisters trade lives—and step into each other's nightmares . . .

Sadie has a proposal for her twin sister, Lorna. She knows Lorna's husband is abusive, and offers to switch places with Lorna to keep her safe. But Sadie has her own reasons for wanting to live Lorna's life.

Lorna finds sanctuary in Sadie's apartment—until an angry associate shows up and she finds herself facing a devastating choice. When an elderly neighbor offers help, Lorna is grateful—but does the neighbor also have ulterior motives?

When Lorna's husband welcomes two family members for a visit, their presence only makes things worse for Sadie—who has discovered that her brother-in-law is far more dangerous than she imagined.

Neither sister wants to stay where they are. Nor do they want to go back to their real lives. The only solution is to start working together. However, working out who the real enemies are may not be so easy . . .

This book contains references to physical and emotional abuse.