After accidentally interrupting a garden party at his neighbor Mr.
Wilson's house, young Dennis Mitchell witnesses the villainous
Switchblade Sam stealing a valuable coin collection as sees it as his
duty to get the coins back to their rightful owner. Dennis encounters
many adversaries who would unwittingly deter him from capturing the
thief -- not the least of whom is his overzealous coach in the school
gym -- but armed with his water pistol, slingshot, or peashooter, the
young hero must make his way through to the end.