A new “Jack Reacher” novel comes out this week. The Sentinel is the 25th Reacher novel and the first written by Andrew Child aka Andrew Grant, the younger brother of series creator Lee Child aka James Grant. A Jack Reacher book is always a fun bit of annual escapism, violent thriller comfort food- and with a streaming series adaptation currently in development (with Titans star Alan Ritchson), there’s more attention than ever on the franchise.