
A promising young boxer is beaten and left nearly dead. Arriving at the hospital, August and Chase intercept a hitman who attempts to finish the kid off with a lethal injection. They pursue the would-be killer through the hospital, finally stopping him with a jolt from a set of defribulator pads. Immediately, they sense that this case involves more than a random beating. August is visited by his former boxing coach, Frank, to whom he hasn't spoken since their falling out many years before. Frank says that he must tell August a secret that has been haunting him. But before he can reveal what he knows, Frank turns up dead, plunging the detectives further into mystery.
Detectives August Brooks and Chase McDonald meet when August and several officers are being overwhelmed by criminals in an explosive shootout. Chase arrives in his Porche and immediately neautralizes the situation with a grenade launcher. Moments later, August discovers that Chase is his new partner, and they are immediately assigned the case to track down a bomber - nicknamed the Daybomber - who has set off a series of explosions in his quest to warn people of the advances of technology.
Chase and August are at August's gym, where they are volunteering their time to help keep kids off the street and out of gangs. In the boxing ring is Andre, a young fighter determined to stay away from gang violence. But when word comes in that Andre's brother has been shot and killed by a rival gang, Andre swears to avenge his brother's death. Chase and August try to persuade him to let the police handle it, but Andre slips from their grasp in pursuit of the killer. The incident also brings back memories for Chase, who is struggling with unresolved guilt over his former partner's murder by a gang youth.