Mystery Street (1950)

When bargirl Vivian (Jan Sterling) discovers that her married boyfriend has refused to leave his wife, she steals a car and drives to Cape Cod to confront him. Several months later her skeleton washes ashore, and local police officer Peter Morales (Ricardo Montalban) must work with Harvard forensics expert Dr. McAdoo (Bruce Bennett) in order to piece together the twisted tale and discover who the murderer is before an innocent suspect pays the ultimate price.