Episode one centres on Nick (David Tennant), whose happy marriage is turned upside-down by the reappearance of his first love.
Episode two centres on Paul (Ashley Walters), a new dad who experiences ‘love at first sight’.
Episode three centres on Holly (Billie Piper), a teacher who develops feelings for a female pupil (Kaya Scodelario).
Episode four centres on Sandra (Jane Horrocks), a middle-aged woman in a stale marriage to an unfaithful husband.
Episode five centres on Adrian (David Morrissey), a divorcee who becomes the victim of an obsessive love. While each episode is self-contained, the series is set in the same town and there is some overlap between episodes.