Directed by Clint Eastwood, this is the story of the 2015 Thalys train attack, when three American friends — Spencer Stone, Anthony Sadler and Alek Skarlatos — who play themselves, discovered a terrorist armed with an AKM assault rifle and a box cutter was attacking people on board the moving train they were on, which was en route to Paris.

The three men, two of whom were off-duty members of the U.S. Armed Forces, realized something was up when a passenger ran past them in a panic. Calmly walking in the same direction just moments afterwards was a terrorist carrying a gun and other weapons. The three men decided immediately to jump in to stop the gunman. This is their story.

Based on the autobiography The 15:17 to Paris: The True Story of a Terrorist, a Train, and Three American Heroes by Spencer Stone, Anthony Sadler, Alek Skarlatos and Jeffrey E. Stern.