Third instalment of the fast-paced middle-grade adventure series, following adventurologist Pearly Woe!Pearly Woe is a worrier.On remote Mammút Island off the coast of Iceland, Pearly’s worrying is put to the ultimate test when she and Pig are winched from a helicopter onto the island to complete a five-day survival challenge – alone.But they are not alone. And that is not the only surprise in store for Pearly and Pig as Mammút Island reveals its many secrets.