The body of a Jane Doe turns up in an abandoned car in New York and the police's only clue revolves around the tattoo she has on her arm, and the fact that someone tried to destroy the corpse to erase the fingerprints.

Early one morning in a New York City park, a passerby walking his dog discovers who ends up being a Jane Doe shot dead in the front passenger seat of a parked car. Homicide Chief Captain Lundquist assigns longtime Homicide Detective, hard-boiled and grizzled Lieutenant Corrigan in charge of the investigation. He also assigns as co-lead younger college educated Detective Frank Tobin, newly transferred into Homicide from the Police Laboratory. While Tobin, who is used to having his head above a microscope in conducting his work, realizes that he has to gain the skills of field work on the job, rough around the edges Corrigan is not looking forward to working with who he considers an egghead. They have to discover not only the victim's identity, but who killed her, why she was killed and the killer's whereabouts, Tobin determining early in the investigation that the killer is indeed a man and a tall one at that. One of the other major leads is the tattoo on the victim's wrist. In the process of their investigation, Corrigan and Tobin will either complement each other in their different working styles, or drive each other crazy in those differences. In following another lead, Tobin meets botanist Dr. Mary Maher, association with who he may want to extend beyond this case in his attraction to her.—Huggo

The body of an unknown woman turns up in a stolen car abandoned in a New York park, and the only clue the detectives on the case have to work from is the tattoo on her arm, and the fact that someone tried to deface the corpse to remove the evidence. From this slender trail, and that of a single stem of grass discovered in the car, they gradually trace back first the victim and then her killer, in a case that's all science and legwork, and no magic inspiration.—Igenlode Wordsmith

Produced, directed and written by the makers of RKO's "This is America" series of shorts, shot in a semi-documentary style on location in New York City: The body of a dead woman is discovered in a car in Central Park, and the only clue is a small tattoo of the emblem of the United States Marine Corps. The police learn that she was a bigamist who defrauded the U. S. Government of the insurance checks of her WWII service men'husbands.' A young detective, Tobin, pieces together small bits of growing evidence and finally shoots it out with the killer in storage yard of a tombstone cutter. A botanist, Mary Marhan, helps with the multi-forensics investigation.—Les Adams <longhorn1939@suddenlink.net>