When corporate attorney Vivian Drake is ambushed with a fraudulent $30,000 restaurant bill from a mother-in-law she doesn't have, she assumes it's a simple case of identity theft—until security footage surfaces showing her dining at that very restaurant on a night she can't remember. The man in the footage claims they've been engaged for six months, and he knows details about her life no stranger should know: the scar on her knee, how she takes her coffee, the words she whispers in her sleep. As Vivian fights to reclaim her identity, she discovers an entire week has been erased from her memory, her bank records show purchases she never made, and hospital records reveal she was drugged with date-rape medications. But the conspiracy runs deeper than a simple con—because the woman who's been living her life looks exactly like her, moves exactly like her, and according to some, is the twin sister her father claimed never existed. Now Vivian must unravel which memories are real, which allies are enemies, and whether the greatest threat comes from the family she thought she knew or the one she never knew existed.