Two Parisians and inseparable friends, Alexandre and Philippe, decide to spend their vacations in Palma. Philippe arrives by car, accompanied by his young wife, while the flighty Alexandre has hired a blonde hitchhiker. But what a surprise to find the villa, rented by correspondence, inhabited by strange and worrying occupants... Soon mistaken for secret agents, Philippe and Alexandre embark on extravagant adventures involving a mysterious shipment of gold.