Timetricks: A Survivor's Guide to Time Travel

From the back of the book: "TIMETRICKS, a survival guide for Time Corps agents, introduces time hopping-traveling through time and between infinite worlds at will. New systems and equipment deal with all the paradoxes of time travel, and agents get new skills, new Paranormal Talents, and new information about the Corps, the Demoreans, and renegades. TIMETRICKS is a necessity for every Time Corps agent."