This post contains spoilers for "Reacher" Season 4, Episode 1, "City of Brotherly Love." After having faced off against Olivier Richters' giant of a henchman in Season 3 and somehow living to tell the tale, Alan Ritchson's Jack Reacher is back. That epic fight doesn't seem to have slowed Reacher down, though. In fact, they've just breezed through about a third of the book on which Season 4 is based, and we're wondering where things are going from here. "Reacher" Season 4 is based on the Lee Child book with the most bonkers reveal in the whole series, "Gone Tomorrow."