A group of 13 nudists from around the world go to a deserted island off the coast of Brazil. There they must live off the land for 90 days in order to win a wager that will save their nature club. Following the example of the Caiapos Indians, they build their own shelters, spear fish, and gather native fruit. The party spends its leisure time sunbathing and swimming. One of the women injures herself in a fall 3 days before their time is up. Will they make it, win the bet and retain their naked freedom?