Marc Elbichon, private detective, investigates about a mysterious serial killer who signs his crimes overwriting a phone dial on the victim's front. To help him, he calls his friends Blacky and Franck, a reporter, Ugo Campani, and his man cleaner, Momo.
Bill Carver is a man wrongfully imprisoned after being framed by gangster Joe Mallon. In prison he is involuntarily involved in a jailbreak, also arranged by Mallon, who is serving in the same facility. The attempted escape fails, and Mallon and his gang are soon caught by the police and put back behind bars—except for Bill, who escapes to the Arizona desert and picks up a stray dog he names Wolf.
Crime lord James 'Jim' Belmont (George J. Lewis) escapes FBI custody and resumes his criminal empire, only to be thwarted at every turning point by British-accented Jerry Blake, the FBI's Operator 99 (Marten Lamont). Belmont plots to steal the crown jewels of the Princess Cornelia, with the aid of his cohorts Matt Farrell, Rita Parker and his crafty secretary Morton.
Paul Reston is considering leaving his wife Linda when she suddenly shoots Anne Braden. Anne's husband Jeff Braden runs to her aid and Linda appears to shoot him in the back, but when Paul brings the police to the scene Jeff is alive and accuses Paul of murdering Anne. The lovers Jeff and Linda attempt to have Paul take the fall for the crime by describing him as insane in their statements to the police.
Zaid Randera (Ronak Patani) returns home to Mayfair in Johannesburg where his father Aziz (Rajesh Gopie), a money launderer is facing death threats from his creditors/lenders. Zaid has been dismissed from his job permanently and finds himself living under the shadow of his father whose status is marred by falling into a debt trap. When a murderous gang threatens the family business, Zaid is compelled into the life he'd hoped to leave behind.
Joe Martin is a fire fighter in Los Angeles who is assigned to the Arson Detail. His first assignment is to investigate a suspicious fur store fire that seems to be set by the store owner himself, Thomas Peyson. Joe's predecessor in the Arson Detail was killed when investigating the same fire and his file with his findings wasn't recovered from his body.
Private detective and former police officer “Tip O’Neill” is hired by a wealthy aristocrat to solve the shooting of his dog. The intrigue continues, with kidnapping, police abuse, assault, and ransom as more characters are murdered, and betrayal within his own household leads to an unexpected conclusion.
On a rainy night, detective Johnny Damico hears gunfire on a dark street and sees a gunman kneeling over a dead body. The gunman identifies himself as a detective from another precinct and then slips away. Damico discovers that the victim was a witness who was to have appeared before a grand jury investigating waterfront crime, and that the same man who shot him also murdered the chief investigator on the case just a few hours earlier.
Inspector Trent (Bellamy) investigates the death of film star Helen Stanley (Patrick) on the set. Another actor in the film, Wallach (Stephen Chase, uncredited) believes he has killed Stanley after he put a live bullet into a prop gun when he "shot" her, and commits suicide after confessing. However the live bullet was still in Wallach's gun.
Jim Dolen, head of a dockworkers' union, cannot resist a good fight until he meets Ann Stacey, to whom he promises to stop fighting in order to marry her. When his brother Dan Dolen is accidentally killed by Mart Hendler, Jim, with the aid of his pal Frankie Donahue, sneaks out to look for Mart. Mart is hiding out with his girlfriend Marie.
Pals Skinny, Danny Graham, Peewee, Algy Reynolds, and Scruno all work at the Reynolds Aviation Company, which is run by Algy's father. Muggs, however, is the only one of the kids who refuses to work, although he drives the gang to work in his jalopy. Once at the aviation company, he spends his time flirting with a flight nurse named Helen Munson who is in love with her test pilot boyfriend, Tom Lawson .
Dr. Lawrence Strelson (Melvyn Douglas) is a famous psychiatrist who conducts a group-therapy session with several high-priced professionals. It turns out that one of the patients is a murderer; the truth will come out, and it will be a shocker.
When a serial killer preys on blondes, a blonde federal law enforcement officer investigating the case decides to take a drastic step. Her husband, a scientist experimenting only on lab animals, transplants brain cells from a comatose patient into the agent's brain, hoping it will stimulate memories that will help her find the killer.
A ring of phony fortune tellers, led by Marvin, "the sightless seer" is in league with racketeers to defraud wealthy clients. Joe Ryan, a reporter, and Judy Allen, an actress agree to help the police by going undercover to expose the ring. Judy poses as a fortune teller, with the help of her friend, Kitty, who is a ventriloquist.
Young amateur sleuth Terence "Slip" Mahoney works cleaning offices in a New York highrise building when he comes across a letter addressed to Terence Mahoney, Esquire. Believing the letter is meant for him, he opens and reads it. The letter tells of an inheritance waiting for him.
US army captain Dave Dillon is stationed at an American base in the British countryside. When heading back one night, his jeep breaks down and he is forced to ask for help at a secluded mansion, Croft House. There live the Wiltons: a lonely, harassed woman, Laura, who is married to drunken, abusive Tom.