Where has the Rhubarb gone?

Rhubarb is no ordinary little girl. Florentine, a ferryboat captain, discovered her in his garden amongst the rhubarb plants and gave her this lovely, fitting name. They live together in a little house by the river. Rhubarb goes to school, but she also knows how to become invisible, can talk to animals, and never forgets anything. So when the inhabitants of the Island of Memory discover that the world is in grave danger, the choice of a saviour is clear. Brave Rhubarb doesn't hesitate and embarks on an unexpected and dangerous adventure, even though she knows full well that time is running out!