Beautiful Mary Kennedy, a police detective's daughter, has come under the influence of her boss, wealthy but unscrupulous lawyer Raymond Cortell. Cortell assigns Mary a high-profile case defending a guilty businessman, J.C. Owen and she gets the crook acquitted on a technicality. Mary is now on the fast track to fortune and success, but her father is heartbroken that his daughter has lost her moral compass. Owens shoots Detective Kennedy while committing a robbery and Mary is forced to re-evaluate her life choices as her father lays dying.

Based on the popular novel by retired Police Captain Cornelius W. Willemse, this realistic detective tale stars Norman Foster and Judith Allen with outstanding performances by Sidney Blackmer and Theodore Von Eltz as the as the corrupt lawyer and his sleazy client. Behind The Green Lights would be Mascot's penultimate production before the studio would reorganize - as Republic.

Norman Foster was a writer and director as well as an actor from the early 1930s to the mid-70s. He is best known for directing several Charlie Chan and Mr. Moto movies, as well as such TV classics as "Davy Crockett" (1955) and "Zorro" (1957-58). Veteran character actor Sydney Blackmer's long career (over 120 films) included roles in Heidi (1937), The High And The Mighty (1954), High Society (1955) and Rosemary's Baby (1968) and earned him a star on Hollywood's Walk of Fame.

Ruthless criminal attorney Raymond Cortell (Sidney Blackmer) is not above bending and twisting the law to suit his purposes, making him a well-paid pariah amongst his peers. Practically the only person who believes that Cortell's tactics are ethical is his faithful assistant Mary (Judith Allen), the daughter of police-lieutenant Jim Kennedy (Purnell Pratt). Mary finally gets a wake-up call when a criminal whom she's helped to acquit shoots down her father during a robbery. She then switches her allegiance to young detective Dave Britten (Norman Foster), who's been waiting a long time to get the goods on the unscrupulous Cortell. BEHIND THE GREEN LIGHTS was Mascot Pictures' next-to-last feature production before the studio was reorganized as Republic.