The House on Telegraph Hill

The House on Telegraph Hill is a 1951 American film noir directed by Robert Wise, and starring Richard Basehart, Valentina Cortese, and William Lundigan. Fay Baker also stars in the film, which received an Academy Award nomination for its art direction. The hill in the title is San Franciscos Telegraph Hill, where much of the story takes place.

Four years later, Viktoria still going by the name of Karin is able to travel to New York, where she meets with Christophers guardian Alan Spender Richard Basehart, a distant relative of Sophias. Karin intends to gain custody of her son, but it becomes clear that Sophia has left her fortune to Christopher when he comes of age. When she realizes that Alan is attracted to her, she realizes that it will be easier to stay in America if she has an American husband. She allows him to romance her, and they soon marry. Alan takes Karin to San Francisco where Christopher meets his mother for the first time, and she settles into Sophias Italianate mansion on Telegraph Hill, where Christopher has lived with Alan and his governess, Margaret Fay Baker.Things seem idyllic at first, but tensions begin to mount between Karin and Margaret, who has not only raised Christopher but is also in love with Alan, and resents Karin for intruding on her life. Karin is also alarmed at the presence of a burntout, dangerously damaged playhouse overlooking the hill, which Christopher claims to have damaged with an explosion from his toy chemistry set. He and Margaret beg her not to tell Alan, since Margaret never has, but Karin is perplexed to discover that he already knows about it. Karin is pleased, however, to meet Marc Bennett again, learning he is an old schoolmate of her husbands and is a partner for the law firm that handles Sophias affairs. He is clearly attracted to Karin, but keeps a respectable distance. ........

Source: Wikipedia