Dan Shepherd is used to putting his life on the line. Working for an elite undercover squad, he€s lied, cheated, and conned in order to bring Britain€s most wanted criminals to justice. But when a powerful drug lord starts to kill off witnesses to his crimes, Shepherd has no choice but to go undercover in a high-security prison-a world where one wrong move will mean certain death. As Shepherd gambles everything to move in on his quarry, he soon realizes that the man he€s hunting is far more dangerous than the police realize-and that he€s capable of striking outside the prison walls and hitting Shepherd where it hurts most.