Crime novelist and amateur detective Agatha Crusty (pronounced ‘croosty’) decides that a health spa is just what she needs to recharge her batteries. She books into Seventh Heaven Health Spa. There she meets the other participants of the health spa weekend: members of a fashion house sales team who are there as a reward for being the highest sales achievers for the year. Things start well with the women experiencing the choice of spa treatments on offer until one of the group is found drowned, presumed murdered, in the Moor Mud Bath. Enter Detective Inspector Simon Aster – a DI with a penchant for complicating the simplest detection methods. When other murders follow, Agatha decides to take matters into her own hands.