When the invitation arrives to attend the opening of a luxurious Swiss hotel—owned by the elusive billionaire Markus Leidman—it feels like a wish come true. Three years after the birth of her youngest child, Lo Blacklock is ready to return to her career in journalism.

The castle on the shores of Lake Geneva seems straight out of Lo's most beautiful dreams, and she hopes to interview Markus. But Markus proves to be an even more difficult target than his reputation suggests. When Lo is notified to visit Markus's room at the hotel in the middle of the night, she goes despite her doubts. There, she is greeted by an old acquaintance who claims to be Markus's lover and says she is in mortal danger.

What follows is an exciting chase across Europe, forcing Lo to wonder what sacrifices she is willing to make to save this woman… and above all, whether she can trust her.

“An ingenious creator of contemporary suspense.” –Wall Street Journal

“A breathtaking, action-packed thriller that evokes intense emotions.” –Clare Mackintosh

“A dizzying ride that will satisfy even the most devoted thriller fans.” –David Baldacci

“Delightfully dark and utterly addictive.” –Lucy Foley

“It starts at full throttle and keeps going right up to the final chapter.” –Erin Kelly

“Every novel by Ruth Ware is a unique and rare gem, and this one is no exception. An intoxicating, suspenseful, slowly building, dreamlike book, multi-layered, atmospheric, and steeped in menace. I loved every page.” –Lisa Jewell