Rainbow Six - John Clark Novel, A Abridged edition

At its heart is John Clark, the ex-Navy SEAL of Without Remorse, a master of secret operational missions, and newly named the head of an international task force dedicated to combating terrorism.  Clark is looking forward to sinking his teeth into a new mission, but the opportunities start coming faster than anyone could have expected; an incident at a Swiss bank, the kidnapping of an international trader in Germany, a  terrible raid on an amusement park in Spain.

Each episode seems separate, yet the timing disturbs Clark.  Is there a connection?  He tries to figure out where all this activity is heading, but there is no way to predict the real threat: a group of terrorists like none the world has ever encountered, a group so extreme that their success could literally mean the end of life on this earth as we know it.