It was meant to be Caitlin's perfect summer, but betrayed by her best friend and her boyfriend, she finds herself hitchhiking home alone, heartbroken, and penniless.

When a smiling family pulls up on the roadside to help her on her way, she's relieved - they seem so friendly, safe. And when they offer her a warm bed in their isolated house for the night, she's grateful not to have to travel back alone in the dark. In any case, she's in no rush to get home, where a grave secret is lying in wait to blow her family apart.

One night soon turns into two, and then three. The increasingly spellbinding couple wants her to stay, and why shouldn't she? Their children need a tutor, and the longer she can avoid home, the better. But then an older member of the household warns her to leave immediately. And when her phone suddenly goes missing, when she realises that this perfect family is a perfect lie, it might not be so easy for her to leave...