Homicide for Three (1948)

On their honeymoon,a young navy officer and his wife are having difficulties in finding a hotel room in Los Angeles until a lady lends them her suite. There, they receive a mysterious telephone call warning them of a murder that is about to be committed. After finding two dead women they hire two private detectives to help them. They learn that the third woman marked for death is the woman who lent them her hotel suite. She is the aerial artist at a circus and the other two women were her friends. The police arrive and arrest the navy officer and his wife, and two clowns who were attempting to kill the aerial performer.