Andrea Schaffer

When a member of their group goes missing, the Thea sisters head to Niagara Falls to find him.

"My cousin Trap was entering the Super Chef Contest, which determines the best cook on Mouse Island--and he was bringing me along as an assistant. Slimy Swiss cheese, I don't know the first thing about cooking fancy dishes--and I didn't think Trap did, either"--Page 4 of cover.

The Thea sisters continue the search for the seven ancient treasures, using the clues found in Aurora Beatrix Lane's travel diary to find a fabulous emerald which once belonged to Cleopatra--a quest that leads them from Moscow, to the Sahara, and finallyBolivia.

Geronimo, Thea, and their cousin Trap explore an old castle built by Grant Gentlemouse, the founder of New Mouse City, and when they find one hundred keys and only ninety-nine doors inside, they set off in search of the missing room.

Join Thea Stilton and the Thea Sisters on an adventure packed with mystery and friendship!

The Thea Sisters participate on a dig at Hierapolis. During their visit to the excavation site, Professor Brenninger unearths a series of priceless and very old figurines. But the Thea Sisters soon figure out that it's a scam. They start to investigate and discover that the figurines are fake, exposing Professor Brenninger's plans.