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American songwriter Philip Graham is visiting Spain when he encounters a former war-time buddy, Englishman Tony Roscoe, who is now working as a society photographer. Through Tony, Philip meets the mysterious Mr. Darius, his fiancée Mitzi Molnar and his niece Marina, who invites him to a rehearsal of the children's folk dance group she teaches. During the rehearsal, Tony suddenly tells Philip that he must fly back to London on urgent business and asks him if he would drive his car back to England. When Tony is unable to recover an important envelope from the hotel's safe, Philip agrees to bring it along later, with the car. After leaving Tony at the airport, Philip is attacked by four men and is knocked out. After he recovers, Darius mentions to him that he suspects that Tony may be involved in unscrupulous business deals, but Philip defends Tony. Later, when Philip goes to Tony's London apartment to deliver the car and envelope, he arrives just as Mitzi is burning some letters, but she flees before he ses her. After Philip finds Tony dead on the floor of his photographic darkroom, he opens the envelope he has brought and discovers three rolls of microfilm. Later, when Philip traces Mitzi, she tells him that she and Tony were once engaged and agrees to help him find out more about why Tony was killed. The next morning, Philip is questioned by police inspector Goldfinch, but tells him that he did not see Tony when he returned the car. After Philip discovers that the microfilm contains top secret formulas of an international pharmaceutical company, he visits the company's plant and, in a tearoom nearby, overhears Zeissman, one of the firm's researchers, admitting to his wife that he sold the microfilm to Tony. As he leaves, Philip slips the film into Zeissman's pocket. Later, both Mitzi and her producer friend, Maxwell Carey, ask Philip for the remains of the letters she was burning at Tony's apartment. Fearing that he may be charged with Tony's murder, Philip meets with Zeissman and reclaims the microfilm to use as protection and bait for the parties who really want them. Later, at gunpoint, Carey attempts to take Philip to meet his boss, but Philip overpowers him and Carey falls to his death. When Philip learns that Marina and her uncle have returned to Spain, he follows them and tells her he suspects that Darius, aided by his male secretary, is behind the conspiracy. With the help of the local police chief, Philip traps Darius into admitting his involvement. Darius tries to escape during a fiesta, hidden under a giant papier-maché head, but his dog reveals his ruse and he is arrested. With the conspiracy now uncovered, Philip comforts Marina.