Despite her recent marriage to the wealthy and poised Tom (Ben Lloyd-Hughes), Charlotte (Emily Berrington) feels trapped in the relationship. She then encounters the alluring and enigmatic Ewan (Bart Edwards), and the pair's intense affair deconstructs the once comfortable marriage. Yet when Ewan seems to vanish without a trace and a girl winds up dead, Charlotte soon finds herself in a precarious situation. Giles Alderson directs the thriller based on the novel by Samantha Lee Howe.