On the night of 16 July 1942, ten year old Sarah and her parents are being arrested and transported to the Velodrome d'Hiver in Paris where thousands of other jews are being sent to get deported. Sarah however managed to lock her little brother in a closet just before the police entered their apartment. Sixty years later, Julia Jarmond, an American journalist in Paris, gets the assignment to write an article about this raid, a black page in the history of France. She starts digging archives and through Sarah's file discovers a well kept secret about her own in-laws.
Bryan Mills, a former government operative, is trying to reconnect with his teenage daughter Kim. After reluctantly agreeing with his ex-wife to let Kim go to Paris on vacation with a friend, his worst nightmare comes true. While on the phone with his daughter shortly after she arrives in Paris, she and her friend are abducted by a gang of human traffickers. Working against the clock, Bryan relies on his extensive training and skills to track down the ruthless gang that abducted her and launch a one-man war to rescue his daughter.
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.