What makes a woman join the most secretive and dangerous unit of Special Forces? What keeps her there? How does she cope with the rigorous physical and psychological training, including `simulated terrorist interrogations', the often deadly missions, the relentless pressures of a macho world, and hte sex?

One Up (the military term for someone travelling solo on a surveillance mission) is the electrifying first-person account of an exceptional young woman's experiences of action and adventure - the first book ever written by a female member of an SAS unit.