Young Owen (Luke Benward) is in for adventure after taking in a runaway dog carrying millions of dollars in stolen gems. The boy gets a chance to use his ingenious intruder deterrents when the jewel thieves track the pooch to his secret fort. But as if trying to fend off the crooks isn't enough, Owen must also deal with the Madman of the Mountain, a fabled character feared by all in this lively comic caper also starring French Stewart.