The obelisk - Howard Gordon

Gideon's Davis's negotiating skills have earned him the role of peacemaker around the globe. But when government big-wig Earl Parker calls on him to bring in a rogue agent, his more practical, tactical skills become vital. Even more so when he discovers that the agent is own brother, Tillman.
Gideon is transported to the jungles of oil-rich Mohan, where Tillman has agreed to give himself up. But plans go immediately awry. The Obelisk - a multi-million-dollar, state-of-the-art oil rig has been seized by terrorists. And both Tillman and Earl Parker are aboard. As tensions rise, and loyalties are tested, Gideon launches a hazardous one-man rescue.