Mystery Street is a 1950 American black-and-white film noir featuring Ricardo Montalbán, Sally Forrest, Bruce Bennett, Elsa Lanchester, and Marshall Thompson.

Brassy blonde B-girl Vivian (Jan Sterling) is agitated and seeking to arrange a meeting with a man she has been dating.

In spite of confiding to him she's "in trouble", he refuses to meet her at the bar where she works, "The Grass Skirt", in Boston, and stops taking her calls.

Shanway subsequently reports his stolen car to his insurance, but claims it had been right outside the hospital where his pregnant wife, Grace (Sally Forrest), was recovering from a miscarriage.

Massachusetts State Police Detective Lieutenant Peter Morales (Montalbán), a determined policeman working out of the office of the District Attorney of Barnstable County, is assigned to investigate the case.

He seeks the help of Dr. McAdoo (Bruce Bennett), a forensics specialist at Harvard Medical School, to learn what the skeleton can reveal.

Local authorities on the Cape eventually finds Shanway's car in the pond, and he's identified in a police lineup by a variety of figures he encountered during his drunken foray and afterwards, when trying to locate Vivian at her boarding house.

Elcott subsequently reads in the paper that the killer used a .45 caliber automatic and informs Lt. Morales that Smerrling has the same type of gun.

[1] Time magazine called it a "low-budget melodrama without box-office stars or advance ballyhoo [that] does not pretend to do much more than tell a straightaway, logical story of scientific crime detection" but notes that "within such modest limits, Director John Sturges and Scripters Sydney Boehm and Richard Brooks have treated the picture with such taste and craftsmanship that it is just about perfect.