Beverly, who is bossy and a bit of a snob, convinces her cautious friend Elizabeth to accompany her on an adventure to the island off the coast. Gerard, Beverly's messy brother who is barely tolerated by the girls, insists on going with them and brings his cat. Things begin to look up when at the last minute the good-looking Kevin joins the trip, but when they become stranded on the island and encounter a strange inhabitant, this motley crew must find ways to support each other and put up with one another's shortcomings.