Neve comes across a troubled woman called Isabelle on Waterloo Bridge late one night. Isabelle forces a parcel into Neve's hands and jumps to her death in the icy Thames below. Two weeks later, as Neve's wreck of a life in London collapses, an unexpected lifeline falls into her lap - a charming cottage in Cornwall left to her by Isabelle, the woman on the bridge. The solution to all her problems. When Neve arrives, alone in the dark woods late one night, she finds a sinister-looking bungalow with bars across its windows. And her dream home quickly becomes her worst nightmare - a house hiding a twisted secret that will change her life forever.