Cloaked strangers and danger abound...

Margery and Clementine Butcher-Baker are coming to the end of another busy half term as dinner ladies at Summerview Secondary school. The school is abuzz with chatter about the upcoming break, the local harvest festival, and the fact that maths teacher, Mr Weaver, hasn't turned up to work in days.

When the pair embark on an evening walk in the woods and discover Mr Weaver's body, with a mysterious symbol painted above him, something suspicious is clearly afoot.

As the nights grow darker and the mysterious symbols continue to appear around Dewstow, the Dinner Lady Detectives are pulled deeper into the case. Can they solve the mystery as deceit and chaos reigns, or will their killer pull off another deadly trick?