The sins of the past have not been forgotten…Pippa Evans had been a teacher at Penbryn Hall for just one week when her body was found alongside evidence of a pill overdose. Going undercover at the private school, investigator Mallory Dawson senses something rotten behind the wealth and privilege. Someone is leaving her coded messages: but do they want to help or harm the case?Mallory soon finds links to the Solstice Sisterhood: a religious cult that believed punishment was cleansing. When a pupil is savagely attacked on school grounds, there is suddenly no time to lose in finding the killer.A taut and twisty crime thriller set in the wilds of West Wales, perfect for fans of Clare Mackintosh and Fiona Cummins.