On an intelligence gathering mission in Tehran, Jack Ryan Jr. meets up with his oldest friend, Seth Gregory, an engineer with an oil company. Seth slips Jack a key and a perplexing message. The next day Jack learns that Seth has disappeared, along with funds meant for a vital intelligence mission. Seth's handlers claim he has turned against his own country. They warn Jack to inform them if Seth should make contact, but not to involve himself further....

"Even though he's on forced leave from the clandestine intelligence group known as The Campus, Jack Ryan, Jr., still finds himself caught in the crosshairs after an attempt on his life is thwarted when he turns the tables on his would-be dispatcher. Convinced that the attack is linked to his recent covert actions with the convalescing Iranian national Ysabel Kashini, Jack sets out to find out who wants him dead -- and why."--from publisher's description....

Recruited by Sigma Force to extract a Russian pharmaceutical magnate, who holds the biological key to a new weapons system, from Siberia, former Army Ranger Tucker Wayne and his military working dog Kane must solve an ancient mystery before the modern world suffers a fate worse than death.

"Luke Daniels is in London, between assignments with the Magellan Billet, when he receives a frantic call from an old friend. Jillian Stein is in trouble. She made a mistake and now her life may be in danger. She needs Luke's help. Immediately. Racing to Belgium Luke quickly finds that she was right. A shadow team of highly-trained operatives are there on the hunt. Intervening, he finds himself embroiled in a war between two determined sides - one...

For years, Jack Ryan, Jr. and his colleagues at the Campus have waged an unofficial and highly effective campaign against the terrorists who threaten western civilization. The most dangerous of these is the Emir. This sadistic killer has masterminded the most vicious attacks on the west and has eluded capture by the world's law enforcement agencies. Now the Campus is on his trail. Joined by their latest recruits, John Clark and Ding Chavez, Jack Ryan,...

"Former Army Ranger Tucker Wayne and his war dog Kane are thrust into a global conspiracy that threatens to shake the foundations of American democracy in this second exciting Sigma Force spinoff adventure from New York Times bestselling authors James Rollins and Grant Blackwood. Tucker Wayne's past and his present collide when a former army colleague comes to him for help. She's on the run from brutal assassins hunting her and her son. To keep them...