The gripping new action thriller novel from the million-copy bestselling author of the Matt Drake series Ex-MI5 operative Joe Mason is on a mission to stop a ruthless satanic group from obtaining a treasure of unimaginable power: the legendary Hellfire. If the cult succeeds, they will become more powerful than any government – unleashing chaos and destruction worldwide. Mason and his team must race against time, deciphering clues from relics scattered across Europe. From Scotland's eerie mausoleums to Milan's hidden crypts, Florence's shadowy alleys, Berlin's sinister underbelly, and even the Vatican's most secretive corridors, Mason must navigate the continent to find the Hellfire first. If he doesn't, all hell will break loose. Can Mason and his team stop the satanists before it's too late, or will the world fall under the shadow of the Hellfire?