Guess Who (Book Version)

This book's author and illustrator is Liz Pichon.

My book's main person loves Caramel Wafers.

My main person's name is Tom.

He has a sister that he doesn't like.

The main character wants a pet but can't have one.

The main character's best friend's name is Derek.

He is in a band named DOGZOMBIES.

My book is part of a series.

The main person has a friend called Amy

What is the name of my book?