Mindguard - The Mindguard Saga, #1

Called out of semi-retirement, the telepath and Mindguard Sheldon Ayers is tasked with protecting an information package located inside the mind of a young woman who claims the knowledge she holds is vital to the future of mankind. Sheldon and his team must help her cross the most dangerous territory in the man-inhabited universe: the Djago Desert. Hunted by the Enforcement Unit, the all-powerful Military arm of the Interstellar Federation of Common Origin, Sheldon's team must fight to keep the Carrier alive and guard the integrity of her mind.
But nobody suspects that Sheldon also has a dark secret, and it could end up changing the fate of the mission.