Amateur boy detective Barton Scott stakes out a familiar territory in the supposedly haunted woods of Raven's Gulch where he unravels a mystery involving a little girl who's hiding in a cave, murder by automobile, and a diamond smuggling intrigue. Blink once and you'll miss Barr's reason for not telling the police and clearing up the whole mess immediately, but then this is the sort of escapade that's meant to hang together on atmosphere alone. At least Bart comes out of it with a new 10-speed bike and a fresh respect for the stamina of girls -- his own little success is more lucky than smart.