Martin Gilmour arrives for the lavish birthday party of his lifelong friend, the charismatic politician Ben Fitzmaurice. The party is thrown into turmoil with the news that the Conservative Party leader has resigned, and Ben's nemesis Jarvis Conrad intends to stand for election. While Martin warns Ben against any knee jerk response, Ben is determined that Martin should undermine Jarvis' bid. But Martin's attempts to derail Jarvis risk the exposure of buried secrets from Ben and Martin's own history.
That history starts with young Martin, raised in Wales by his working-class mum, Sylvia, winning a scholarship to an elite boarding school, where he first encounters Ben. Martin's fascination with Ben grows as he visits his country estate and meets his twin sister Phoebe – who can see the truth of the bond between the two boys. Faced with revelations from their past, will Martin be able to keep Ben's impulses in check and avoid tragedy?
