A wickedly funny series featuring Mortimer: the small kid with big ideas! In this book, Mortimer covers his whole school in slime. With slimy facts and activities at the back, perfect for young readers.

Mortimer Keene is full to bursting with madcap plans, and if it's trouble you're after, look no further! With laugh out loud illustrations, rollicking rhymes, and short chapters ideal for new readers, this first book sees Mortimer Keene and his slime machine on the attack!

When slime upon slime attacks the school, a special task force of teachers set out to find Mortimer Keene and his slime machine at the source of the crime...

Created by Chris Mould, illustrator of A Boy Called Christmas and Tim Healey. If you like Horrid Henry, you'll love Mortimer Keene.