"The symmetry should have tipped me off." After a violent incident at work, Tamsin goes looking for a fresh start in a remote cottage far away from her old life. Here she could make real friends, find a job she loves, become a whole new person, even. But the solitary cottage is actually a semi-detached, with only a thin wall separating her from a total stranger. Her neighbour is an enigma. Dowdy one moment, vivacious the next, but always wearing an unnerving smile. Tamsin can't shake the feeling that there's something wrong with her, especially when she starts experiencing disturbances in her own home. As the locals share strange stories about her house, and her barely contained paranoia spirals out of control, Tamsin begins to suspect that the past she was so desperate to escape might never let her go.