The bombing in the film was loosely based on the 2004 terrorist attack in Cologne, a bombing carried out by neo-Nazis targeting Turkish immigrants. In the Cologne bombing, a neo-Nazi group detonated a nail bomb hidden on a bicycle in front of a Turkish barber shop, injuring 22 people, four of whom were critically injured.
The trivia item below may give away important plot points.
The film is divided in the three chapters "The Family", "Justice" and "The Sea" and cinematographer Rainer Klausmann - shooting with the ARRI Alexa - created a slightly different look for each one. The first chapter was shot mostly outside with a mobile ARRI Alexa in the 'Super-16' mode to get a rougher look. The second chapter with the many courtroom scenes used new and extremely sharp anamorphic lenses by ARRI and was shot in a static way. For the third and final chapter, which is set in Greece, Klausmann chose old vintage lenses to get a softer look. The short 'home video' segments shown in each chapter were shot on regular smartphones.