Hot on Milton's heels though is the Accountant (William Fitchner). We get the sense he isn't from around here, and he's looking to take Milton back. As it turns out Milton died a long time ago, and broke out of hell to see justice done. The rest of the film involves shoot outs, car chases, and truly epic acts of infernal intervention on the part of the Accountant to ensure that Milton actually gets his wish and kills the cult leader Jonah King (Billy Burke), who murdered Milton's daughter.
When all is said and done, and the bullets have all finished flying, Milton manages to erase King from existence using the Iron God Killer, a gun stolen from hell. Milton gives care of his granddaughter over to Piper, and then he dies. Or seems to, at least, since you can't kill a dead man. But, his task complete, Milton agrees to go peacefully back to hell so that the Accountant can straighten his books and keep the ledgers how they should be.