Geronimo Stilton travels back in time to find and rescue Professor Paws von Volt, who was lost during a trip into the past to prove the authenticity of an Egyptian artifact.

"Welcome to Camp Mwhaaa-haa-ha-a-watha! This summer is going to be epic. Epically evil, that is. 'Cause I'm going to Evil Scientist Summer Camp! No annoying little brothers. No annoying zombie goldfish. Just me, my best friend Sanj, our notebook of evil plans, and my truly evil (and totally forbidden) vampire kitten Fang. We've got it all planned out. Okay, so maybe I didn't expect for the totally not-evil Geeky Girl to show up, or for Sanj to find...

After discovering a clue from an old pirate captain, Amelia Bedelia digs for buried treasure.

Amelia has big plans for her summer, until her mom signs her up for sleep-away camp. The all-girls camp is old-fashioned and can't compete with the high-tech computer camp across the lake, where her cousin Jason is spending his summer. As summer really kicks off, the two camps begin to interact with one another and figure out that they're all happier when they learn to live and learn together.