Daisy and Hazel are finally back at Deepdean, and the school is preparing for a most exciting event- the fiftieth Anniversary.

Plans for a weekend of celebrations are in full swing. But all is not well, for in the detectives’ long absence, Daisy has lost her crown to a fascinating, charismatic new girl – while Beanie is struggling with a terrible revelation.

As parents descend upon Deepdean for the Anniversary, decades-old grudges, rivalries and secrets begin to surface. Then the girls witness a shocking incident in the woods close by – and soon, a violent death occurs.

Can the girls solve the case – and save their home?