Bookmaker struggles with police and is arrested.

Kathy, a young child, has befriended the elderly miser who lives on an upper floor of the building where she lives. Today, while playing outside, she also makes friends with Jules, a homeless petty thief. Later, when she is in the miser's apartment, two violent criminals break in. They tie a rope around Kathy and dangle her out of a window, threatening to let her fall to the ground if the miser does not give them the combination to his safe. Outside, Jules sees her in danger, but to help her he must risk dealing with the police.

Arthur and Martha are out walking when they see an aviator and his biplane. When the aviator offers to take them up, Martha excitedly accepts, but Arthur refuses to go along. Martha thoroughly enjoys her ride, but it makes Arthur angry and jealous. But Arthur soon has bigger problems to worry about.

The physician's death orphans his two adolescent daughters. Their older brother is able to convert some of the doctor's small estate to cash. But it is late in the day, and with the banks closed he stores the money in his father's household safe. The slatternly housekeeper, aware of the money, enlists a criminal acquaintance to crack the safe. She attempts to get into the adjacent room where the sisters tremble in fear, but finds that the door is locked. The drunken housekeeper menaces them by brandishing a gun through a hole in the wall. But the resourceful girls use the telephone to call their brother who has returned to town. He gets the message and organizes a rescue party.

At 10 years old, Owens becomes a ragged orphan when his sainted mother dies. The Conways, who are next door neighbors, take Owen in, but the constant drinking by Jim soon puts Owen on the street. By 17, Owen learns that might is right. By 25, Owen is the leader of his own gang who spend most of their time gambling and drinking. But Marie comes into the gangster area of town and everything changes for Owen as he falls for Marie. But he cannot tell her so, so he comes to her settlement to find education and inspiration. But soon, his old way of life will rise to confront him again.

Blizzard, deranged from a childhood operation in which both his legs were perhaps needlessly amputated after an accident, becomes a vicious criminal, and eventually mob leader of the San Francisco underworld. Out for revenge against the surgeon who performed his operation, he undergoes brain surgery which has a chance of altering his anti-social behavior.

A secret society holds a meeting to determine what to do about a powerful and dangerous man whom they have been studying closely for the past three months. They all agree that he deserves to die. Two of the members, Farallone and Forrest, are both in love with Lilith, the group's only female member. But Lilith accepts neither of them, preferring to devote herself to the group's cause. When the group meets again and deals cards to all the members, Forrest draws the ace of hearts, meaning that he will be the one to carry out the assassination. Lilith then suddenly agrees to marry him, in order to give him courage. But after their first night together, both of them begin to feel differently about what they have planned.

A projectionist is studying to be a detective and is in love with a young lady. When he proposes her, his rival steals the chain watch of her father and incriminates him. The disappointed young projectionist returns to his job and while projecting the film, he dreams on being the detective of the story. Meanwhile, the girl finds the truth and acquits the guilty of the projectionist to her father.