Tom Clancy's new Jack Ryan thriller, Command Authority, is available to pre-order now. Jack Ryan Jr. returns in Locked On, the gripping thriller from Tom Clancy. The Ryans - father and son - are fighting on two fronts...When a deadly terrorist alliance creates the potential to blackmail any world power into submission, it's got to be stopped before it is too late. That's just the trigger Jack Ryan Jr needs to take his work for shadowy intelligence agency The Campus from the back room to the sharp end: black ops. Meanwhile, his father, Jack Ryan Sr, campaigning for re-election as US President, is up against a privately funded vendetta to discredit him. Caught at the heart of the conspiracy is former Navy SEAL, John Clark. And Ryan Sr soon discovers that being his friends could have deadly consequences. With the breakneck speed and military action scenes that have made him the premier thriller writer of our time, Tom Clancy delivers a novel of high-tech warfare in which the enemy within may be even more devastating than the enemy without. Locked On follows the gripping Dead or Alive and The Teeth of the Tiger as the explosive third novel in Tom Clancy's Jack Ryan Jr. series. Praise for Tom Clancy: "Truly riveting, a dazzling read". (Sunday Express). "A brilliantly constructed thriller". (Daily Mail). Thirty years ago Tom Clancy was a Maryland insurance broker with a passion for naval history. Years before, he had been an English major at Baltimore's Loyola College and had always dreamed of writing a novel. His first effort, The Hunt for Red October, sold briskly as a result of rave reviews, then catapulted on to the New York Times bestseller list after President Reagan pronounced it 'the perfect yarn'. From that day forward, Clancy established himself as an undisputed master at blending exceptional realism and authenticity, intricate plotting, and razor-sharp suspense. He passed away in October 2013. Mark Greaney has a degree in international relations and political science and is pursuing his master's in intelligence studies with a concentration on criminal intelligence. He is the author of The Gray Man, On Target and Ballistic.