Warren William is the eponymous trouble maker for poor old "Insp. Crane" (Thurston Hall) who bets him that he can't behave himself for just one day! Well, of course he can't - indeed pretty sharpish he and stalwart "Jamison" (Eric Blore) are up to their necks in the theft of some US treasury plates from a supposedly impenetrable car invented by "Baker" (Lloyd Bridges). That's only the half of it - there's a killer afoot too and our not so wily policeman only has one suspect. What now ensues is an entertaining, if formulaic, join-the-dots mystery as June Storey provides an adequate damsel in distress ("Gloria") and the dialogue some fun and mischievous quips for Blore to raise the odd smile. There's a bit more meat on the bones of the adventure element to this with plenty of daft fisticuffs before the baddie is suitably apprehended. It's a bit too long - takes a while to get up an head of steam, but it does get there and ultimately it's a watchable little story that begs the question. When will "Crane" ever learn to trust in the "Wolf"?