Black Mamba - David Pratt - Bog

Saints City. An island community where everything appears idyllic. But in the city's underworld, Lord Magnus and the dreaded Gangster Federation spread crime and corruption.
Daniel Stone is a teenager grieving for his father, battling the Payne Brothers' Street Gang and trying to impress Kelly Montgomery, heiress to the city's most powerful firm, the Montgomery Corporation.
Stone learns how the Montgomery Corporation has developed a pharmaceutical weapon in secret that can alter criminal minds to stop them reoffending. This discovery shapes his destiny and transforms him into the Black Mamba, a professional mercenary who hunts down and brings to justice the worst of society.