Set in a tenement boarding house, a lonely confirmed bachelor occupies a room across the hall from a dour spinster. Children run amok in the hallways playing pranks. Believing the bachelor perpetrated one particular prank, the spinster woman enters his room to confront him. She is followed by a neighbor child. Meanwhile, the other children have stolen a scarlet fever quarantine sign and posted it on the bachelor's door. The police, unaware that the quarentine sign is a prank, enforce the confinement. But aided by the sweet disposition of the toddler quarantined with them, the icy relations between spinster and bachelor begin to thaw, . . .

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.