It's Not Her by Mary Kubica

Two families at a secluded lake resort are at the center of a chilling crime in this twisty thriller from the bestselling author of Local Woman Missing

A scream shatters the silence…
Courtney Gray’s peaceful vacation turns into a nightmare when she discovers her brother and sister-in-law dead in their lakeside cottage. Her niece Reese is missing. Her nephew Wyatt is asleep upstairs—unharmed.

A town full of secrets…
As police swarm the quiet resort, dark truths about Courtney’s family—and the town itself—begin to surface. Is Reese a victim… or the killer?

A truth no one saw coming…
With everyone hiding something, Courtney races to uncover the terrible mystery. But the closer she gets, the harder it is to know who—or what—to trust.