Frank and the other close members of his team are brutally attacked in a burst of seemingly random acts of violence.

Frank investigates a call girl service operated by a cop.

Frank works to convince the brass to devote equal resources to resolve kidnappings on opposite sides of the Bridge district - one in a wealthy neighborhood, the other in a poor neighborhood.

When one cop leaves his partner to fend for himself during a pursuit, Frank gets involved.

A hostage situation during a restaurant robbery gone bad turns Frank into a negotiator.

An undercover officer is murdered and Frank decides to investigate, but he has to do so without revealing the cop's identity.

When beat cop Frank Leo becomes fed up with the corrupt police brass, he leads a walkout strike and makes himself a target as a renegade union rep.

A shooting outside a gym requires Frank to investigate two fellow police officers.

An officer is killed in a roadside attack.

Frank is willing to face the brass and account for himself, but he discovers that his father has been made a target as well.

"Play by the book" rules are set aside when Frank looks into the death of a retired narcotics officer.

A couple of cops face the consequences of their decision to transport an injured child to the hospital, rather than wait for an ambulance.

An undercover weapons deal goes awry.