The Accountant

The Accountant has an excellent cast, led by Ben Affleck as an autistic savant. Using his skills he's become an accountant, often using an alias and being hired by criminal organisations.
As JK Simmons (as an agent for the US Treasury) puts it: Imagine that you launder huge sums of money. You keep a record of transactions, but most of it is hidden behind codes and euphemisms. Then suddenly you find that some of the money has gone missing somewhere. Ben Affleck is the man you hire to come in and look at your accounts to see where the money has gone.

He gets hired by a robotics company (owned by John Lithgow), after Anna Kendrick has noticed something strange about the accounts.

Amongst this JK Simmons has put another agent (played by Cynthia Addai-Robbinson) in charge of the investigation into exactly who the accountant is, and That-guy-who-was-in-the-walking-dead-and-is-now-the-punisher (Jon Bernthal, I had to look that up) is a mercenary involved with businesses of some description (his first appearance is about him trying to restore the pension funds of the company who hired him).

The mysteries of exactly what is going on are fascinating, the villain's plot is coherent and extremely interesting. The acting is unbelievably good, the action is absolutely incredible. There is a lot of dark comedy, most of it derived from Ben Affleck being unable to understand emotions (so either not understanding someone's reaction, or not reacting in the way you would expect).

This is an intelligent, witty, funny and extremely exciting action film. Go see it.