When her mirror twin goes missing, Casey is led to a deadly paradise where no one escapes…

A dark, pulse-pounding psychological thriller from Bonnie Traymore.

Casey and Nora are mirror twins, identical—sort of. Casey is right-handed, Nora is left-handed. Their moles sit on opposite cheeks. In terms of personality, they are also diametrically opposed. So, when her high-strung sister disappears after a fight with her husband, Casey shouldn’t be as concerned as she is. Nora’s done it before. Her husband seems nonplussed. But this time, things feel different. It’s a twin thing; Casey knows it in her bones. Something is terribly wrong.

Casey hires private investigator Hank Mercer, and Hank discovers that Nora’s been on the dark web—lured by an entity that calls itself Switzerland, promising to take away your pain and leave you in a state of eternal bliss, for a hefty fee. The trail leads to a luxury wellness retreat hidden in the Mexican jungle. Determined to find her sister before it’s too late, Casey poses as a resort guest and heads to Mexico to rescue her sister. As Casey digs deeper, she finds something far more sinister than she could have imagined, and it’s possible that neither of them will get out alive.