Simon, Maya and Penny never thought they would return to Tamarind, but a long-lost friend tells them that the mystical island is in danger, and they know they must go back. The island is more mysterious than ever before.

There's a vanishing village on a lake where people - and their secrets - hide, miraculous creatures are everywhere and where does the little blue door in the middle of nowhere lead to?

As the peril mounts and they venture deeper into the island, can the children save Tamarind before it is lost forever.