Career soldier Markus cuts short his deployment to care for his teenage daughter, Mathilde after his wife is killed in a train crash. But then he has visitors: a fretful statistician and his hacker friends, who believe the crash was no accident – according to their calculations, it was masterminded by the outlaw bikie gang Riders of Justice to silence a witness who was about to testify against them. The PTSD-afflicted Markus needs no further excuse to unleash his very particular set of skills, but can he hide his vigilante campaign from Mathilde?