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, Deepdean has changed. Daisy has lost her crown to a fascinating new girl – and many of the Detective Society’s old allies are now their sworn enemies. Then the girls witness a shocking incident in the woods close by – a crime that they’re sure is linked to the Anniversary.