Rats with Badges - Martin Lou

When veteran Detective Sergeant Tony Spinella is asked to investigate his own department's Internal Affairs Division, he considers saying no. As a former Marine, he never envisioned turning on his own-investigating, in particular, a man who's like a brother to him. The need for justice, however, wins out, and Spinella takes the case.

They're called The Rat Squad: A team of rogue Internal Affairs Detectives who use their position to murder, deal in stolen drugs, and intimidate honest officers. They think their clandestine activities are safe until Spinella gets involved. Feeling threatened, they bring in two top-level killers to take Spinella down. They fail, but the collateral damage leaves the detective sergeant hungry for vengeance.

A deeply personal loss causes good cop Spinella to embark on a quest for personal revenge that stretches from the quiet streets of Capitol Hill all the way to beautiful Saint Mark's Square in Venice, Italy. What began as a difficult investigation is now a mission of blood as Spinella vows to take down The Rat Squad using his Marine training and bring them in, dead or alive.