“In an investigation, assumptions kill.” Jack Reacher (Alan Ritchson) finally closed the book on his adventures in Maine in Season 3 of Reacher. Marking the ex-military officer’s first undercover mission throughout the television series, the wandering drifter is pulled into a world of shady truck deliveries, unregulated business meetings, and contraband weapon sales — courtesy of business magnate Zachary Beck (Anthony Michael Hall). But the more Reacher gets sucked into this criminal underbelly, the more he realizes that Zachary’s just a mere puppet. The real perpetrator is out there in plain sight, and it just so happens to be someone from Reacher’s painful military past.