Regie : Sarmad Masud, Mit : Cole Anderson-James, Hugh Dennis, Sian Gibson,

En route to Gemma and Terry's wedding, Gemma diverts them to a quick mystery at a couples' therapy retreat, where death threats have been received. Despite being undercover, some of the therapy work creates cracks in their relationship, and when a member of the group is found dead, Gemma and Terry are unhappily stranded in the moors along with the other guests and an increasing body count.