The Ghostwalker series is the name for a collection of paranormal/romance novels by the American author Christine Feehan which feature the a group of men in the Special Forces and young women who have had their psychic abilities enhanced in a secret experiment.
The Ghostwalker series has groups of men (and a few women), called Ghostwalkers who go on special missions.
Ghostwalkers have psychic abilities and genetic enhancements, some abilities and enhancements are more rare than others.
Each Ghostwalker team must have an "anchor" who draws the psychic backlash, especially of violence, away from the other team-members.
Without an anchor, the Ghostwalkers' abilities are limited because of the psychic backlash and the inability to manage in crowds.