"The Sentinel: A Jack Reacher Novel" by Lee Child and Andrew Child is a thrilling fiction novel published by Random House Publishing Group in 2020. This hardcover book is part of the Jack Reacher series and spans 368 pages, offering readers an action-packed and suspenseful storyline set in the world of thrillers. With a military and general thriller focus, this novel is sure to captivate fans of the genre looking for a gripping and adventurous read."