When his mother eloped with an Italian opera singer, Louis Mazzini was cut off from her aristocratic family. After the family refuses to let her be buried in the family mausoleum, Louis avenges his mother's death by attempting to murder every family member who stands between himself and the family fortune. But when he finds himself torn between his longtime love and the widow of one of his victims, his plans go awry.
Prof. Millard pretends to be dead and helps Jeff King ferret out Vulcan, the evil traitor at the science academy. Donning his Rocket Man costume King goes from one hair raising rescue to the next in order to keep the newly invented Decimator out of the clutches of Vulcan and his minions.
A war veteran suffering from amnesia, returns to Los Angeles from a San Francisco veterans hospital hoping to learn who he is and discovers his criminal past.
Roy Martin aka Roy Morgan is a burglar and former war-time Radio & Electronics Engineer who listens in to radio police calls, allowing him to stay one step ahead of the cops.
A gold mine in Arizona, that was formerly losing a lot of money, suddenly turns into a veritable money-making machine. However, the owner, instead of being happy about his now profitable business, insists to Charlie that something is fishy and that someone is out to murder him. Charlie and his "crew" travel to the mine, pretending to be tourists staying at a nearby dude ranch so as not to arouse suspicion, and discover that the owner may well be right--it looks like the mine is being used as a cover for criminal activities, and that someone is indeed out to murder him.
An insurance man wishing for a more exciting life becomes wrapped up in the affairs of an imprisoned embezzler, his model girlfriend, and a violent private investigator.
When 9-year-old orphan Oliver Twist dares to ask his cruel taskmaster, Mr. Bumble, for a second serving of gruel, he's hired out as an apprentice. Escaping that dismal fate, young Oliver falls in with the street urchin known as the Artful Dodger and his criminal mentor, Fagin. When kindly Mr. Brownlow takes Oliver in, Fagin's evil henchman Bill Sikes plots to kidnap the boy.
An innocent dancer is accused of murder after his shoe prints are found at the scene, but his wife follows the trail of clues to find the real perpetrator.
Joe Sullivan is itching to get out of prison. He's taken the rap for his accomplice Rick, a sadistic mobster who owes him $50,000 from the job they pulled. Rick sets up an escape for Joe, assuming that Joe will be killed while fleeing. But with the help of his love-struck girl Pat and his sympathetic legal caseworker Ann, Joe gets further than Rick intended...
Captain Hugh "Bulldog" Drummond is called in to solve the murder of a man from whom two lead soldiers were stolen. Drummond learns that the two soldiers were part of a set of thirteen which formed the key to a hidden vault of treasure. Following some clever sleuthing and set-up on Drummond's part, the guilty man is trapped in the vault,which is hidden behind the fireplace.