Rob is settled in a great relationship with Stuart, but his past catches up with him in a startling way. Photographs of Stuart engaged in sexual acts arrive in the post, sending Rob into turmoil. Stuart denies cheating, so who is the man in the pictures? Rob aims to find out, discovering someone from his past has a side to him even Rob finds hard to swallow.
The two men turn into amateur detectives and soon realise they have stumbled into something far more sinister than they could have imagined.