Alek Skarlatos, the Greek-American who helped take down a terrorist on a train headed for Paris, inked a new deal to write about his heroic actions during the attack. Entitled The 15:17 to Paris, the coauthored book will be published on August 23.

After being deployed in Afghanistan, twenty-two-year-old Skarlatos, an active duty member of the Oregon National Guard, was traveling around Europe with two childhood friends, Anthony Sadler and Spencer Stone. On August 21, 2015, the friends took Thalys train 9364 from Amsterdam bound to Paris via Brussels, when suddenly a Moroccan man believed to be Ayoub El-Khazzani entered train car number 12, armed with an assault rifle and close to three hundred rounds of ammunition. Several passengers attempted to disarm the gunman, including Stone, who became injured after the assailant turned his gun then a knife on him. Skarlatos grabbed the AKM rifle, beating the attacker with the rifle until he was unconscious.

The 15:17 to Paris is being co-written by Skarlatos, Stone, and Sadler and will cover not only the actions these American heroes took on the train that day but also their friendship. Adding his journalistic expertise to the writing of the memoir is Jeffrey E. Stern, author of The Last Thousand: One School’s Promise in a Nation at War. The 15:17 to Paris was sold to editor Benjamin Adams at Public Affairs.