Kiri, Jed and twins Emma and Ethan frequently journey on ‘elastic island’, a unique way to travel that sends them pinging across the ocean to a variety of tropical destinations. This time, they travel with Blong the Cat and Heathcliff the Dog to beautiful Rarotonga.

They are expecting to relax in the sun, but it’s not long until they run into problems. Firstly, Mighty Moko, the resident grumpy gecko who lives in their room, is determined to get rid of them, no matter what! But his annoying antics are quickly surpassed when all the black pearls on the island are stolen in a brazen heist, the thief leaving clues scattered around the island. The children are determined to solve the clues, but even with the help of the wise Mana Tiaki, will they be successful? Will the people of Rarotonga ever see their precious black pearls again.