SHAMUS

A man named Victor Papas is attacked by two men at his home and burned to death with a flamethrower, along with his girlfriend. Shamus McCoy, a private detective in Brooklyn, New York, receives a request from E.J. Hume, a wealthy man who runs many companies, to find the diamonds that were stolen from Papas as well as about the murderers. Hume says that Papas stole several million dollar worth of diamonds from Hume just before he was killed. McCoy wonders why he was selected to do the job, but is attracted by the high fee and accepts the proposal. McCoy uses his friend Springy, an informant, and a drug dealer he knows to investigate Papas' background, and finds out that he and his girlfriend worked for a company called River Edge Export.

According to Springy's information, the president of River Edge Export is Felix Montaigne, a famous former football player. After retiring from football, he was hired as an executive at River Edge Export, and apparently raised a large amount of money from somewhere, and a year later he bought the company and became the president. It is also revealed that Papas had connections with Bolton, a bouncer at a bar called “Health Club”. Shamus waits for the bar to close and ambushes Bolton, and beats him up and extracts information from him, and he is told that Felix killed Papas.

The next morning, McCoy visits Felix Montaigne's luxurious apartment, where Alexis, the woman he met the night before at the Health Club, appears. She is Felix's elder sister. Felix, who is at home, admits that Papas and his girlfriend worked for his company, but says he does not know about their criminal activities. When asked about the source of the funds to buy the company, he hints at the existence of a partner, but does not reveal who it is.

A few days later, Shamus is attacked by three thugs and warned to "forget about Papas." Alexis also visits McCoy's apartment and asks him to investigate her brother Felix, whose behavior has been strange lately. McCoy, who is attracted to Alexis, accepts the job.

The next day, McCoy sneaks into the River Edge Export warehouse and discovers a large number of weapons, including machine guns, and a man's dead body hidden there. He is discovered by a trio of assassins, but manages to escape. After that, he learns that Hume is the major shareholder of River Edge Export, and realizes that this is not a case he can handle, so he tells Hume that he cannot continue the investigation. He then visits Colonel Hardcore of the Army Weapons Depot, whose signature was on the invoice he obtained at the warehouse. Of course, Shamus does so while disguised as a weapons dealer. As expected, the colonel has been illegally selling weapons to River Edge Export. While colonel is explaining about tanks and other things to McCoy outside, he is shot and killed by two men in a car, while McCoy barely escapes.

Then, it turns out that, as Bolton said, it was Felix who killed Papas and stole the jewels. Hume had asked McCoy to investigate, not knowing that Felix had done it. However, as McCoy's investigation progressed, Hume feared that his arms smuggling would be revealed, so he sent a hitman to eliminate McCoy. Also, Springy was killed by someone.

McCoy breaks into Hume's mansion and confronts Hume, but he is bitten by Hume's ferocious dog and is captured by his minions. In the room, he finds Felix, who has been beaten and is on the verge of death. When McCoy and Felix are taken outside, McCoy escapes from the minions, but Felix is shot to death. McCoy subdues Hume's minions one by one and finally stops Hume from escaping in a car. The police arrives and Hume is arrested.