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.

Raised as a slave, Danny is used to fighting for his survival. In fact, his "master," Bart, thinks of him as a pet and goes as far as leashing him with a collar so they can make money in fight clubs, where Danny is the main contender. When Bart's crew is in a car accident, Danny escapes and meets a blind, kindhearted piano tuner who takes him in and uses music to free the fighter's long-buried heart.