The premise of this cartoon is Ignatz the mouse is beaned by Krazy Kat with a brick as a sign of love. Krazy Kat loves Ignatz Mouse. Officer Pup loves Krazy Kat.

Philo Vance, accompanied by his prize-losing Scottish terrier, investigates the locked-room murder of a prominent and much-hated collector whose broken Chinese vase provides an important clue.

The stooges are stage hands who also have small parts in a big play. They quickly get on the bad side of the producer. First they fail to prevent a famous critic from sneaking into the audience. Then Shemp accidentally adds a pot holder into a cake they bake as a prop. During the play the stooges (as southern gentlemen) and the rest of the cast spit up feathers during what was supposed to be a serious scene. The critic thinks it’s a hilarious satire and the boys are redeemed.