The "Jack Reacher" books follow Jack Reacher, a former Army Major of the military police, as he travels across America taking on investigations that interest him. The first book, "Killing Floor," finds Reacher dodging jail in Georgia as he investigates a counterfeiting scheme after his brother Joe has been murdered.
As of September 2015, there are 20 "Jack Reacher" books by author Lee Child. In the fifth book, "Echo Burning," Reacher hitchhikes in the Texas summer heat and is picked up by a woman named Carmen, who is being followed by someone. Her husband is a violent man locked up in jail, and Reacher decides to help Carmen fight him and anyone else who wants to harm her.
"Bad Luck and Trouble" is book 11 in the series, and it follows Reacher from Los Angeles to Las Vegas. The action begins as an anonymous person deposits money into Reacher's bank account, triggering his curiosity. Reacher soon realizes the deposit is a signal only his former Army team knows, prompting him to search for his teammates and uncover a murderer.
In book 19, "Personal," Reacher travels to Europe to find a sniper who tried to kill the French president. The sniper is dangerous and elusive, and Reacher must travel over several countries to capture him and find out who hired him and why.