Tonal comparisons = Burn Notice + The Blacklist
Capital Punishment follows S, a loan shark that offers his clients an alternate way to pay their debts. By killing an immoral person close to them, a brother that beats his wife, a cousin that deals coke. When another loan shark harms one of his customers, S takes a personal day to track him down utilizing another customer's resources, Detective Richard. Richard uses this opportunity to bring in the other shark and bring his track record up. Once they find the shark, the two learn he was helping a man bring automatic weapons into the city, he calls the man Novella. S is shocked to hear this name and won't reveal the identity of the man to Richard for an unknown reason.
As the story goes on into the series, a beautiful detective Karrie comes into play. She knows exactly what S does for his customers and she wants him to take on bigger people, mob bosses, sex slavery rings, hitmen, etc. S is not a hitman. Chaos erupts in each episode. Bomb scares, school shootings, race wars, and much more, all created by one man, Novella, and only S knows this. S can't reveal this to the police due to reasons left in the past, so he must bring him down himself with the help of Richard, Karrie, S' underground snitch Flank, and his mysterious accountant simply known as A or, The Accountant.