Last year, Nan's three best friends ventured into the canyons near their small town and never returned. Now one of them is back, and Nan can't believe it... because she's the one who killed them. From the New York Times bestselling author of Wilder Girls comes another dark thriller about friendship, jealousy, desire, and revenge, with a twist ending that needs to be talked about.

Last summer, Luce, Edie, Jane, and Nan took a boat out for one final swim in the river. It was a perfect summer night.

But the only one who returned that night was Nan. Edie, Jane, and Luce disappeared, and Nan's story has always been the same: She has no idea what happened. The girls went ahead, and it was as though they vanished into thin air.

Now, one year later, all of Saltcedar has gathered at the river for a memorial. Nan even recreated the outfit she wore that fateful day last summer. And when Luce climbs out of the water, no one is more surprised than Nan.

Because Nan killed her. Right before she killed Edie and Jane.