Dennis and his faithful hound Gnasher are out to make every day as much fun as possible, but their adventures often lead them into trouble. When the mayor ruins Cream Pie Day at Dennis's School by reserving all the pies for his own special Summer Fete, Dennis & Co orchestrate an elaborate pie heist - with a little 'help' from Angel Face, who secretly has her beady eyes on the pies for herself, and ensures the menaces are caught red-handed! How far will the boys go to liberate the pies from their rival menace and reunite them with their rightful owners? It might be worth a stint in detention after all...