Claire Dawson wakes from a traumatic accident with selective amnesia—or so her detective husband Ryan believes. In truth, she's been faking memory loss for six months while secretly recording every conversation, gathering evidence of the lies that built their marriage and the truth about what really happened before the crash. But when Ryan discovers her phone full of recordings, Claire finds herself locked in their bedroom with a hidden camera watching her every move and two cops deciding how to "finish it" before their captain arrives with a warrant. Her only lifeline is a series of cryptic text messages from someone claiming to be her sister Vanessa—the same sister Ryan insists died six months ago. Now Claire must survive the night trapped in an apartment with a husband who's already planned her murder once, and this time he knows she remembers everything.