During a routine welfare check, the police find local shop owner Mr Fitzgerald at the foot of his stairs, dead. There is broken glass over the floor of his shop, his dog has been locked in the kitchenette cupboard, and on the counter is an envelope addressed to Mrs and Mrs Margery and Clementine Butcher-Baker – The Dinner Lady Detectives. As the town mourns Mr Fitzgerald’s death as an unfortunate accident, Margery and Clementine cannot shake the sense that there is something suspicious about the scene.

They are convinced this was no accident. But why would anybody want to harm an elderly shopkeeper? And with the culprit still at large, and determined to cover their tracks, can they get to the bottom of the case before there is another victim?