Guinn "Big Boy" Williams returns home to his estranged father's ranch to find the old man murdered by any one of several potential villains. It seems he was killed over a substantial amount of cash he'd hidden somewhere in the house, but didn't get around to disclosing the whereabouts of.
It's interesting to see character actor and sometimes sidekick Williams in a starring role. However, despite a few good action scenes, the picture's way too slow, with not enough of the good stuff in the first half. Still, it's hard to entirely dislike an old movie with secret passages and a masked killer creeping around, waiting to get people.
Big Boy is likable enough and an adequate hero. He should have picked a better starring vehicle though.