One hot summer, Dee disappeared. Now she's back … but she's not the girl you knew.

Sera and Dee were the best of friends.

Until the day that Dee and her brother Leo vanished from Sera's life, during a long hot summer fifteen years ago.

Now Sera is an adult, with her own child, five-year-old Katie, and has returned to her childhood home after her husband's death.

While she grieves, the past haunts Sera at every turn … and then Dee and Leo return to their small Hampshire village, along with Dee's young daughter.

But Dee is silent and haunted by her demons; no longer the fun-loving girl that Sera loved. And when Sera uncovers the shocking secret that Dee is hiding, it's clear that the girl she knew is long gone–and that the adult she has grown into might put all of them in danger …