Homicide for Three (1948)

While on shore leave to celebrate his first anniversary Lt Peter Duluth Warren Douglas takes his wife Iris Audrey Long to a Los Angeles hotel but is turned away When mysterious Colette Stephanie Bachelor offers them her suite the young couple becomes entangled in a murder plot Aided by two PIs Peter and Iris find two corpses and are desperate to locate Colette before she becomes the next victim but the killers are one step ahead