In the early evening of August 21, 2015, the world watched in stunned silence as the media reported a thwarted terrorist attack on Thalys train no: 9364 bound for Paris--an attempt prevented by three courageous young Americans travelling through Europe.

The film follows the course of the friends' lives, from the struggles of childhood through finding their footing in life, to the series of unlikely events leading up to the attack. Throughout the harrowing ordeal, their friendship never waivers, making it their greatest weapon and allowing them to save the lives of the more than 500 passengers on board.