It's February 1930, just months after Black Tuesday. In light of their financial woes, a small-town mortician and his arrogant wife start murdering the rich to keep their beloved funeral home afloat.

Great story idea.

I would change a few things:
1) Relocate setting to big city (more $$, more bodies)
2) Change date to end of The Great Depression (banking getting better = fewer bodies)
3) Make the wife the antagonist, and husband an unwitting accomplice.
4) State the protagonist and their goal.

In depression-riddled America, a mortician employs a new business model that includes a free murder per pine box.

Ha! This is warped!.... How about they run a gas station/mortuary in some God-forsaken stretch of Okie Rte 66. The Fords get gas and go. The Deusenbergs pull in for gas, and don't pull out. The cemetery on the hill fills slowly on the hill behind the pump.