After London witnesses a hit-and-run car accident that kills an elderly woman, the dog methodically stalks the driver until the man's pangs of guilt -- and a cunning canine "quirk of fate" -- expose the crime.
Hobo teams with another hobo (Herb Vigran). Together, they unsuccessfully try to save a pair of work horses from the fertilizer factory. Next, they must help a bus load of kids during a flash flood, but need extra muscle to pull it off.
A man who dropped out of medical school to raise money for his education, keeps promising he'll finish his degree "next fall semester." But after hearing the same promise for 5 years, the townspeople believe his plans are empty talk. London helps remedy the situation.
When a young dreamer and would-be skipper accepts a lucrative fishing charter to Mexico, he gets more than he bargained for. London saves the day and also helps the young man to realize what's most important in life.