Shamus is a 1973 movie about a rugged private detective named Shamus McCoy who is hired to track down a missing person and recover stolen diamonds. As he delves deeper into the case, he becomes entangled in a dangerous web of crime and corruption in New York City. With his trusty mustache and sharp wit, Shamus navigates through a gritty and treacherous world filled with nefarious characters and high-stakes situations. Along the way, he encounters a variety of colorful individuals, including a seductive femme fatale, a ruthless gangster, and a mysterious cat. Armed with his skills and determination, Shamus sets out to unravel the truth and bring the culprits to justice.

A private investigator is confronted by the police AND the mob about the killing of a former private-eye associate.