This crime drama is set in the fictional San Francisco eatery, Mary Grady's Chowder House which is presided over by the crusty Mary, a tough broad with a marshmallow heart. One of her regulars is a newspaper reporter who decides to write about the widow Grady's long lost son who disappeared 15-years-ago. The trouble begins when a vagabond fugitive, who got in trouble after trying to prevent a murder, learns of the reporter's search and decides to pretend to be the prodigal son. At first the gruff Mary and her adopted daughter are skeptical. But later when the detective who pursues the killer closes in, they end up defending the young man. When the fugitive sees a picture of Mary's late husband, he realizes that the real killer is Mary's estranged son. Soon the widow and the reporter begin putting things together and find themselves closer to finding her real son. They do not know what he has done so the good-hearted fugitive tries to thwart them at every turn. This puts him in grave danger, but this doesn't sway him. Unfortunately, he fails and Mary finds her long-lost offspring, and just after he admits that he is her son, he is killed in a police shoot out.