The Gripping Thriller In Tom Clancy's Jack Ryan Series - Inspiration For The Blockbuster Amazon Prime Tv Seriesthe Deadliest Threat Is The One You Never See Was A Text Message That Started It.president Jack Ryan's Old Friend (and Former Operative) Father Pat West Warns Of A Honey Trap, A Possible Murder And A Secret Ai Project - Calliope - Falling Into Chinese Hands, Before Going Silent.this Leaves Jack Ryan With Two Pressing Problems.firstly, Find And Rescue His Old Friend, Last Seen In Indonesia. And Secondly, Discover What Exactly Calliope Is And How Much Of A Threat It Poses.but It's Not The Danger You See That Catches You 's The One You Never See Coming.praise For Tom Clancy'exhilarating. No Other Novelist Is Giving So Full A Picture Of Modern Conflict' Sunday Times'a Brilliantly Constructed Thriller That Packs A Punch' Daily Mail'a Virtuoso Display Of Page-turning Talent' Sunday Express'heart-stopping Action.