Duke's fame comes from how, when he found out who he was working for, stole $15m from the Chicago Mob gave the bulk of it to charities and went on the run.
Mob Boss Jimmy Serrano (Dennis Farina) is, not unexpectedly, also looking for Duke but so is FBI agent Mosely (Yaphet Kotto) who wants to turn him State's evidence.
Shenanigans ensue.
Things aren't going particularly great, he's split up with Vanessa (Morena Baccarin) and sucks at his job at a car dealership but at least he still has friends.
That is until the Time Variance Authority agent "Paradox" (Matthew Macfadyen) shows up and informs him his whole timeline is collapsing because Wolverine (Hugh Jackman) died in the events of "Logan" and offers him a chance to finally really matter.
No good will come of this.
CW: all the big swears and lots of messy comic gore/deaths