One night, while riding alone through the meadows, Fenimore Fillmore arrives at a farm that is under attack by gunmen and becomes a hero for helping the farmer, a man named Bannister, fend them off. As a token of his appreciation, Bannister then invites Fenimore for dinner and to spend the night. Early the next morning, Fenimore awakens to discover that his gun is missing; he assumes that Bannister's son Billy has borrowed it to take it to school. He sets out to find where his gun went. (wiki)