It's been four years since she last saw them - four years since they graduated and dispersed across the country, not staying in touch. Four years since Zoe ended things with Dan because the memories were too much to bear. Four years since that night - the night an unexpected death rocked their friendship group. Invited to Scotland to celebrate Rod's inheritance - a large and looming manor house on an isolated island - Zoe is apprehensive at seeing everyone again. But at least she has the drive up with Lily to ease her into it all, right? Wrong. Because Lily's also agreed to give Dan a lift, and not wanting to be left out, Rod is joining them too, as well as a young woman he says is his assistant. And when they come into trouble on a cold, dark, desolated Highland road, it sets off a chain of events which will leave them all shaken to their very core, and questioning everything they thought they knew. . .