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Pilot Jim Brennan flies to Istanbul, Turkey, for the first time in five years and is immediately summoned to the office of customs Inspector R. P. Nural. Although Jim, now a private pilot, was a decorated American Air Force officer, Nural suspects him of involvement in a diamond-smuggling operation that took place when Jim lived in the city years earlier. After Nural warns him he will be watched, Jim returns to the hotel in which he stayed previously, where he is told that, because visiting Americans Charlie and Marge Boyle are occupying his old room, he must take the room next door. Jim goes to the café, where he sits at his regular table and reminisces about the events that occurred there five years ago: Jim shares a drink with beautiful German tourist Stephanie Bauer, with whom he has recently met and fallen in love. When she learns that he is jeopardizing his work to spend time with her, she insists that he be practical and accept a quick job flying businessmen to Cairo. Upon his return, his friend, merchant Aziz Rakim, nervously offers Jim a lovely bracelet to give to Stephanie. Soon after, Jim discovers a hidden compartment in the bracelet that contains diamonds, and stashes the jewels in his ceiling fan. That night, he presents the bracelet to Stephanie along with a marriage proposal, and she accepts. When they return to his room, however, they find a prowler who introduces himself as Paul Renkov and asks for the diamonds. Jim throws him out, but the next night, Paul follows Jim through the streets of the city, and with the help of several henchmen, beats him up. Their leader, Mr. Darius, then steps into the light and demands the diamonds, but when Jim refuses to cooperate, Darius orders his men to knock him out. The police find Jim and take him to their headquarters, where Nural informs him that Aziz has been murdered. After Nural states that Aziz may have been connected to a shipment of stolen diamonds that were smuggled into the country in a bracelet, Jim denies any knowledge of the theft, and later convinces Stephanie to leave with him that night for Paris. When she stops at her hotel room, however, Darius' men knock her out and steal the bracelet. At the same time, Jim finds Nural in his room, and the two banter amicably until the inspector reveals that he has impounded Jim's plane and plans to hold him in custody until Jim leaves the country. Realizing he now cannot retrieve the diamonds, Jim goes along with Nural to Stephanie's hotel, where they find the building is in flames. Jim runs into the fire to save her, but the blaze forces him to retreat. Back in the present, Renkov interrupts Jim's reverie by informing him that Darius wants to meet. At Darius' office, after the importer tells Jim that he smuggled in the diamonds and will not rest until he recovers the gems, Jim punches him. That night, Jim encourages the Boyles to leave the hotel, then walks toward their room, but stops short when he sees Stephanie on the stairs. Although he rushes to embrace her, she informs him her name is Karen Fielding and she has no remembrance of him. She leaves with her husband, wealthy Englishman Douglas Fielding, who found her five years earlier wandering out of the hotel fire, dazed, her memory gone. Jim visits Stephanie's hotel in the morning, but she insists that any knowledge of her past will only threaten her new life, and sends him away. Douglas stops Jim on the way out and asks him to leave them in peace, but Jim states that Stephanie must decide for herself which part of her life she wants to hold on to. Later, Stephanie, clutching the bracelet Jim gave her, secretly visits him at the café, where they sit in their old table. She asks him to tell her about her past, but when he does, she gets flustered and leaves. Hours later, Jim sneaks into the Boyles's room to retrieve the diamonds, but hearing Nural in the hallway, stashes them in Charlie's suitcase. Before leaving, Nural informs a worried Jim that Stephanie never returned home that night. Fearing that Stephanie has been kidnapped, Jim spots Renkov outside his room and allows the inept criminal to capture him. Jim is brought to an abandoned warehouse, where he surreptitiously drops a lit cigarette, causing a fire. Darius enters and, failing to notice the fire, brings him to the room where Stephanie is being held. To divert Renkov, Jim pretends that Stephanie was the real diamond thief, but before Renkov can hurt her, Jim knocks him out and shoots Darius. He runs with Stephanie through the fire to safety, but when the flames send her into shock, Jim brings her to Douglas, promising to let her go. In the morning, as Jim leaves for the airport, Stephanie awakens, calling Jim's name, then informs Douglas that she now remembers everything and chooses to stay with him. They head to the airport, where Nural is searching the Boyles's luggage, forcing Jim to turn over the diamonds and admit his part in the crime. Nural decides to let Jim leave the country, and as his plane lifts off, Stephanie reaches the airport and gazes longingly at the aircraft. Douglas sees and realizes that she still loves Jim, and Nural, who has also been watching, orders the plane to turn around and return to Istanbul.