Bell, Book and Candle

Bell, Book and Candle is a 1958 American romantic comedy Technicolor film directed by Richard Quine, based on the successful Broadway play by John Van Druten and adapted by Daniel Taradash. It stars Kim Novak as a witch who casts a spell on her neighbor played by James Stewart. Rounding out the supporting cast are Jack Lemmon, Ernie Kovacs, Hermione Gingold and Elsa Lanchester. The film is considered Stewarts last as a romantic lead.

Sidney Redlitch Ernie Kovacs, the author of the bestselling book Magic in Mexico, arrives in Sheps office thanks to a little magic after Gillian discovers Sheps interest in meeting him. Redlitch is researching a book on witches in New York, and he acquires an inside collaborator when Gillians warlock brother Nicky Jack Lemmon volunteers his services in exchange for a portion of the proceeds.Gillian uses her magic to make Shep lose interest in Nicky and Redlitchs book, and then confesses her identity as a witch to Shep. Shep becomes angry, believing she enchanted him just to spite Merle, and the two quarrel. Gillian threatens to cast various spells on Merle, such as making her fall in love with the first man who walks into her apartment, but she finds that she has lost her powers because of her love for Shep. Meanwhile, Shep finds he literally cannot leave Gillian, because of the spell. To escape, he turns to another witch, Bianca De Pass Hermione Gingold, who breaks the spell. Shep confronts Gillian and leaves her heartbroken. He then tries unsuccessfully to explain to Merle that Gillian is a witch. Months later, Shep returns and discovers Gillian has lost her magic powers because of her love for him. When he realizes her love is true, the two reconcile. ........

Source: Wikipedia