Danger Signal: After robbing and murdering his married lover and then staging her death to look like suicide, conniving philanderer Ronnie Mason relocates to Los Angeles. Under a new identity and claiming to be a writer, Ronnie finds lodging at the home of Hilda Fenchurch and her mother. He woos Hilda, knowing she has money, but when he discovers that Hilda's sister, Anne, has just inherited $25,000, he switches his attentions to her.