For Philip, Dinah, Lucy-Ann and Jack, the holiday in Cornwall is everything they'd hoped for - until they begin to realize that something very sinister is taking place on the mysterious Isle of Gloom. But they're not prepared for the dangerous adventure that awaits them in the abandoned copper mines and secret tunnels beneath the sea.

Fergus and Zeke love being the class pets in Miss Maxwell's classroom, and they do everything the students do--listening at storytime, painting masterpieces during art class, and keeping their own special journals. But when it's time for the school science fair, the mice aren't sure just how to get involved. Lucy wants to time them as they run through a maze, but they want to do an experiment, not be an experiment. Then Zeke comes up with a great...