Two young women disappear late one night; their mothers receive a terrifying voicemail that upends everything they think they know about their daughters—and the truth will unravel everything in this gripping new psychological thriller from the number one international bestseller Andrea Mara.

The morning after a glamorous, luxury wedding, two best friends go to wake their twenty-four-year-old daughters. When they open the door to the shared room in the pool-house, they find a lamp smashed on the floor, a blood stain on the carpet, a ringing phone—and both girls are nowhere to be seen.

The police come and the mothers discover something shocking. Something inexplicable. All signs point to one of the daughters trying to kill the other. The mothers are stunned by the horrifying realization, but are determined to work together to find their girls, a task that will push their friendship to its limits. And of course, they can't help but wonder: which girl is the killer and which is the victim?