Tom gets interrupted from playing William Tell with darts (with Jerry being the poor victim with the apple on his head) when he gets a telegram stating his "eccentric Aunt Harriet" died and has left him a million dollars!
Jerry is all excited, too, as happy as Tom. How could that be? Well, points to the bottom of the telegram, which Tom didn't see. It said "all benefits will cease should the cat bring harm to any living thing EVEN A MOUSE."
Tom makes all the headlines in the New York City papers as he marches his way to a penthouse on Park Avenue. (Jerry has a mouse hole with a veranda on top that says, 1/2 Park Ave. He wears a top hat, tails, gloves, etc., too!)
However, as the story unfolds we get the message that "money doesn't buy happiness." Jerry hogs most of Tom's luxury items and food and each time the cat is ready to kill the mouse, Jerry pulls out the telegram reminding him he can't. It's driving Tom nuts. In the end, well, he'd rather be poor and happy by beating the crap out of Jerry.
In all, I would label it slightly below-par, laugh-wise. It looks like one of the earliest Tom and Jerry animated shorts. The artwork is not up to par and it just has a primitive feel to it.