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While his wife, Iris (Ida Lupino), is away on vacation, building superintendent Artie Sawyer (Andy Griffith) meets young and attractive Claudine (Susanne Hildur) in a bar and offers to let her stay in his building's empty apartment. She accepts, and to Artie's surprise moves in with a shady boyfriend, Billy (Michael Brandon), and two other hoods. Convinced they're up to no good, Artie sneaks into the apartment and discovers plans to detonate a bomb in the bank next door. Wikipedia