Monk is called to the scene where a pet seems to be a killer: Ian Blackburn is found in his the panic room with 4 shots and his pet chimp holds the weapon. Is the animal really guilty???

Karen Stottlemeyer films a documentary of Captain Stottlemeyer's division. Despite the Commissioner's objections, Monk helps solve the case of a headless corpse, a fatal fire at a wig factory, and a hat thief all in one fell swoop.