When a Wellington family sails back to the Marlborough Sounds from an overseas voyage, their twins are re-united with three Tasmanian friends who have discovered a strangely abandoned campsite near an old wrecked hulk.

During their investigation of the mystery behind this abandonment, the twins are able to introduce their friends to many aspects of the New Zealand environment, including the controversial issues behind the predator-free programme.

An illustrated multi-layered tale of friendship and intrigue, as relationships evolve.