Simon, Maya and Penny never thought they'd return to Tamarind, the mystical island of adventure . . .

But when a long-lost friend tells them Tamarind is in danger, they know they must go back. On their arrival Tamarind is more mysterious than ever before. There's the vanishing village of the water 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 they venture deeper into Tamarind, the peril mounts - can the children save the island before it's lost forever?