Who Framed Boris Karloff?

It's 1938 and there is murder afoot on the set of Son of Frankenstein — Boris Karloff has been framed for murder! He joins forces with Basil Rathbone, in full Sherlockian mode, and a gleeful Bela Lugosi. It's a case of the legends of horror meet the three stooges as our heroes search for a missing movie mogul and cross swords with the Hollywood Mob.