The girl in question by Tess Sharpe

Nora O’Malley has survived – senior year, that is. School’s over, but her life isn’t, which is weird since last she checked, her murderous stepdad Raymond is finally free. Determined to enjoy summer before her (possibly) imminent demise, Nora plans a backpacking trip with Iris and Wes. And Wes’s girlfriend tags along. Amanda’s nice, so it’s not a huge issue. Until she gets taken. Or rather, mis-taken – for Nora. Now they’re deep in the woods. Raymond has a hostage. Nora has no leverage. Iris is carving spears out of sticks. And Wes is building booby traps. It’ll take all of them to make it out alive. But someone is lying. Someone is keeping secrets. And someone has to die.