My Life as a Cartoonist

In Book 3of the popular My Life series, Derek Fallon's plan to help out a new classmate backfires miserably.There's a new kid in Derek Fallon's class. His name is Umberto and he uses a wheelchair. Derek's family is still fostering Frank the monkey and Derek thinks it would be great to train Frank to assist Umberto. But Derek quickly realizes that Umberto is definitely not looking for any help. Derek soon becomes the butt of Umberto's jokes. On top of that, Umberto starts stealing Derek's cartoon ideas and claiming them as his own. How did Derek get himself into this mess and how can he find a way out before he is the laughingstock of school?