The HMAS Hammersley has to stop for repairs after its propeller is caught in a fishing net, which also contains the corpse of a man, later identified as never missing-declared Edward 'Teddy' Pritchard. While waiting, the boys want to fish, the girls to hike, so everyone visits an officially uninhabited, idyllic island. On it they find Peter's ecologist paradise commune. Handsome member Sean wins the favor of Bomber, who rudely rejects all attentions from again utterly confided Robert. 2Dads nearly drowning in a toxic vapors swamp's quicksand is only the first scary discovery to follow.