One night, after a fight with James, Cassy wakes up to discover her toy warrior, Len, has come alive! Like many other girls her age, even though she is scared, Cassy follows Len into her bathroom where she embarks on the adventure of a lifetime in an amazing new world!

Entering this quirky, fun and exciting place, she meets Len’s fabulous family, explores the friendly Memonia and plays an unusual game of Qualla. But, just when she thinks the fun is over, Cassy encounters her greatest challenge yet: she cannot go home! And strangest of all, who is the mysterious old man they encounter on their adventure? Will Cassy and Len discover the answers to their questions - and more importantly, will she manage to find her way back home?