Mads Mikkelsen plays a soldier whose wife dies in a train accident. Everyone assumes it was an accident but some nerds (one of whom was also on the train) figure out it was a planned attack by the Riders of Justice gang, to kill a guy who was going to testify against their leader. Mikkelsen then works with the nerds to take the gang out. Has good action but is more about everyone processing through their respective grief. Also surprisingly funny, though it gets pretty dark. Currently VOD.

https://www.youtube.com/watch?v=l09T87hEstI