One of Stan Laurel and Oliver Hardy's later films, the jokes are by now a bit too obvious but still usually hilarious. Professor Hartley (Arthur Space) is an eccentric inventor who is always coming up with madcap schemes. His latest invention is a new explosive which he is told he must protect (thanks to a bit of mischief). He calls a detective agency but only the janitors are available, but the prospect of good living and cash leads the janitors (Laurel and Hardy) to pretend to be detectives...
Meanwhile a gang is planning to rob Hartley of jewels but when members of the gang hear about the explosive they want to steal the explosive instead and sell it to the enemy (insert a bit of wartime propaganda here). Laurel and Hardy are set off with a fake bomb hidden in an accordion to lead the thieves away, but of course they have the real bomb...
A very funny film even if the jokes are often so obvious you can spot them coming a mile off. There isn't much plot, more a framework for a series of comedy set-pieces. The visual gags are very good though. Not the best Laurel and Hardy film by any means but still has plenty of the duo's magic to make the film very worth watching.
