A wickedly funny series that will appeal to all young scientists, created by Chris Mould, illustrator of A Boy Called Christmas and Tim Healey. If you like Horrid Henry, you'll love Mortimer Keene.

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 perfect for new readers, this fourth book in the series sees Mortimer Keene involved with DINOSAURS...

Mortimer Keene has invented a Time Machine! Soon the school is surrounded by dinosaurs. But what happens when a pterosaur grabs poor Emily Bruce?

'The illustrations are hilarious... one funny story!' - Guardian