Tumtum and Nutmeg are enjoying a quiet life in Nutmouse Hall, when General Marchmouse comes to stay. The General has a new pogo stick and is looking for adventure. Recklessly, he bounces out of Nutmouse Hall and into Rose Cottage - the home of the Mildews. He takes Lucy's doll's house under siege with the help of some toy soldiers and takes a ride on Arthur's train set. He makes a terrible mess and Lucy and Arthur think a bad fairy has come ...Tumtum and Nutmeg have to take the General under house arrest to stop his bad behaviour, but the General plots his escape. Events spiral and the General is taken by Arthur and Lucy and imprisoned in theirschool! General Marchmouses's reputation as an officer and a gentlemouse is about to change.