The Sentinel signed book. Autographed by Lee Child and Andrew Child. Copyrighted, 2020. 7x10 inchesThe Sentinal is the twenty fifth book in the Jack Reacher series. Co-written by the series creator Lee Child and his brother Andrew Child, it was released on 27 October 2020. Description It is close to midnight on a Saturday night when Jack Reacher gets off a bus at the Greyhound station in Nashville.