To escape her past, Anna takes a job at a hotel on the remote Scottish island of Rum, but when seven guests join her, what started as a retreat from the world turns into a deadly nightmare. Each of the guests have a secret, but one of them is lying – about who they are and why they're on the island. There's a murderer staying in the Bay View hotel. And they've set their sights on Anna. Seven strangers. Seven secrets. One deadly lie.