In Miserere, a police officer from Interpol is assigned to investigate a murder that leads him to an ex-Nazi and a deaf children's choir. As he delves deeper into the case, he uncovers dark secrets and confronts his own nightmares.

What happened, that 24th of December? This is what officer Chartier wants to find out. To understand, he will have to go back 48 hours earlier to Franck's Christmas eve. Franck is an insignificant drama-teacher by day, but also belongs to a nameless and leaderless militant organisation - the Animal Liberation Front. These characters are bound by a limitless empathy towards mistreated animals, and will have to show courage to complete a mission they have been preparing for months.

Jean-Jacques spent 9 years in prison for robbery. When he comes out, he finds the neighborhood where he grew up but things have changed ... The country is in crisis, the young people are holding the business and his old friends are urging him to resume his activities ... It may be for Jean-Jacques the time to ask the right questions.