Since it originally premiered, Tracker has had a leg up on the other procedurals that dominate the TV landscape. With a charismatic lead in Justin Hartley, an interesting ensemble of supporting characters, and a case-of-the-week format that allows Hartley’s Colter Shaw to travel to new locations and new mysteries in every episode, the show has a winning formula. Colter has proven himself uniquely qualified to be the person who tracks down missing people.