Unlike the other two previously-released features sharing the premise, The Marksman is not based on a book, but instead an original screenplay by Chris Charles, Danny Kravitz, and Robert Lorenz that centers its story on an Arizona rancher named Jim Hanson (Neeson). Living on the south side of the state, his property is partially bordered by the fence between the United States and Mexico, and as a result he regularly has run-ins with illegal immigrants. In most circumstances he is quick to call on his daughter-in-law, Sarah (Katheryn Winnick), who is a member of the U.S. Border Patrol, but circumstances change when he encounters a mother, Rosa (Teresa Ruiz), and her son, Miguel (Jacob Perez), desperately running away from a drug cartel.
