Brutal, sad, funny, and disarmingly sweet-natured, "Riders of Justice" is not so much a revenge movie as a movie about revenge. That might seem like a distinction without a difference until you get to the end of this surprising feature from writer/director Anders Thomas Jensen ("After the Wedding," "Red Road," "The Salvation") and look back on every place that it has taken you.
The story starts a few days before Christmas in Estonia. A girl walking along a holiday-decorated street with her grandfather spots a red bicycle offered for sale by a street vendor but asks for a blue one instead. The vendor is part of a crime ring and calls an associate, who steals a blue bike belonging to Mathilde (Andrea Heick Gadeberg), which causes Mathilde's mother Emma (Anne Birgitte Lind) to have to pick her up at the train station, only to have their car fail to start, which causes them to take a commuter train home. A statistics and probability expert named Otto (Nikolaj Lie Kaas) gives the girl's mother his seat, and shortly after that, a freight train smashes into the commuter train and several passengers are killed, including Mathilde's mother and a tattooed, bald, scowling fellow who was supposed to testify against a fearsome gang, Riders of Justice. Otto saw another man get off the train before the crash, oddly dropping a full beverage and a nearly uneaten sandwich in the trash on his way out, and becomes convinced that the crash was an assassination and the other victims were collateral damage. As it happens, Mathilde's father is a stony-faced soldier named Markus (Mads Mikkelsen, a frequent leading man for the writer/director).