In the novel, Jack Reacher used to be a military police officer in the U.S. Army. After leaving the U.S. Army, he took over the investigation of some suspicious or dangerous cases as an investigator.

When Jack is drawn to a coded message and a member of his elite unit, the 110th Army Special Investigators, is murdered, he reunites with his former comrades to investigate and discover the case is fraught with danger.

Jack Reacher in the book is a former U.S. Army Military Police military investigator with a mysterious style and a solitary habit. He is 6 feet 5 inches tall (about 1.95 meters) and weighs between 210 pounds and 250 pounds (95-95 pounds).113 kg), Aaron Ritchson’s height is 1.88.

《Smallville》,《Titans》Alan Ritchson plays the protagonist Reacher, and his collaborators《Smallville》Serinda Swan and Shaun Sipos join, Serinda Swan plays Karla Dixon, Shaun Sipos plays David O'Donnell, Ferdinand playsAM, Rory Cochrane plays Shane Langston, and Frances Neagley, played by Maria Sten in the first season, continues to be Jack's partner.