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Supported by an allowance from his wealthy mother, a young American named Bill arrives on Ibiza, an island off the coast of Spain, to visit his friend Denny. Denny lives with a group of young expatriates, who devote themselves to thrill-seeking and sexual promiscuity through the use of drugs, including LSD. Their acknowledged leader is an older married man, Eric, a former college art instructor, who is conducting experiments with hallucinatory drugs. Although Bill is urged to join in the experiments, he refuses, preferring instead to spend his time with Lise, a German girl whom he eventually marries. But their happiness ends abruptly when Bill's mother cuts off his allowance and Lise resents having to support her husband. Not knowing what else to do, Bill returns to the island and moves in with Eric and his family. Before long he is smoking marijuana and accumulating large gambling losses. When Eric comes up with the idea of holding up a wealthy Barcelona antique dealer, Bill rejects the plan until Eric slips him a dose of LSD. Then, while undergoing a series of fantasies, he responds to Eric's suggestions and agrees to join Denny in committing the robbery. The scheme backfires, however, when the antique dealer puts up a struggle and Denny kills him with a candlestick. Racing back to Eric's colony, Denny seeks escape from reality by taking drugs. There were witnesses to the crime, however, and before long the police trace Denny to Eric's and make an arrest. Bill, meanwhile, has made his way to a monastery high above Barcelona. Confessing to the monks, he seeks their assistance and guidance. The police are contacted and they capture the real criminal.