One September morning in 2008, an investment banker approaching forty, his career in collapse and his marriage unravelling, receives a surprise visitor at his West London home. He struggles to place the dishevelled figure carrying a backpack, until he recognizes a friend from his student days, a brilliant man who disappeared years earlier under mysterious circumstances. The friend has resurfaced to make a confession of unsettling power. Theirs is the age-old story of the bond between two men and the betrayal of one by the other. As the friends begin to talk, and as their room becomes a...