This 3-book set of mass market paperback editions includes the following titles in the Jack Ryan universe:
Without Remorse (ISBN 9780425143322):
Rainbow Six (ISBN 9780425170342):
Ex-Navy SEAL John Clark has been named the head of Rainbow, an international task force dedicated to combating terrorism. In a trial by fire, Clark is confronted with a violent chain of seemingly separate international incidents. But there is no way to predict the real threat: a group of terrorists like none the world has ever encountered, a band of men and women so extreme that their success could literally mean the end of life on earth as we know it.
The Bear and the Dragon (ISBN 9780425180969):
A high-level assassination attempt in Russia has the newly elected Ryan sending his most trusted eyes and ears—including antiterrorism specialist John Clark—to Moscow, for he fears the worst is yet to come. And he’s right. The attempt has left the already unstable Russia vulnerable to ambitious forces in China eager to fulfill their destiny—and change the face of the world as we know it…