The Protector by David Morrell

The Protector - Cavanaugh is a former Delta Force member who now works for Global Protective Services.  His current assignment, Daniel Prescott, is currently in hiding in an abondoned warehouse. Prescott has developed a hormone that induces fear.  Two groups are after him, one wants him dead, the other wants him for his information. As the two are discussing terms of protection and Prescott's disappearance, the warehouse is attacked.  Cavanaugh is able to extract Prescott and get him to Global's safe house.  The safe house is attacked and in the ensuing confusion, Prescott attacks his protectors.  Cavanaugh is the only Global survivor.  Not knowing who to trust, recruits his wife to help him track down Prescott.