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. Their goal is to free dogs, condemned to be sold to laboratories for the purpose of live experiments. Their philosophy: when something has gone beyond the boundaries of reason, you have to forget about what's legal, and care about what seems right. During the questioning, Franck understands that one of his fellow campaigners betrayed him.