Jock Brennan, Inspector of the Major Crime Squad, is pursuing a vicious armed robber who has stolen police service pistols. Ian Cochrane, public servant and scientist, is in charge of collecting the forensic evidence. These two men argue heatedly at the crime scene. Forensic is not Jock's priority. His attempt to dismiss Ian from the scene results in a stand up fight. In court, Ian is cross examined relentlessly. He's stunned at the attack on his personal integrity. Jock is stunned when they actually win the case. The two men's antagonism comes to an abrupt halt when the Police Club's annual party is bombed.

The last vestiges of Laz's undercover persona are blown when Jock orders him to start acting like a detective. He can no longer work the streets without risking his life from the criminals he once lived amongst. It's a terrible loss of identity which leads to a violent outburst. Defending his Senior Sergeant, he assaults a member of the public. This brings him under the cold hard scrutiny of the Internal Investigations. Before it's over, Laz could be charged with a criminal offence.

Megan, the analyst, takes off on a tangent of her own. She decides to pursue the bombers by assuming they require large amounts of money to finance the bomb and their continuing silence. She uncovers a possible suspect whose very distinctive description leads her to the world of sexual offences. She discovers Kelly, an angry rape victim who is disillusioned with the police force's inability to convict offenders. Megan has to batter her way through Kelly's defences to get a photo-fit of her vicious attacker .. and a possible lead to the identity of one of the bombers.

With the forensic evidence largely tagged and ready, Carol becomes increasingly cut off from Ian and the lab. Now that she has returned to work - abandoning her maternity leave - her entry into the team rearranges alliances at a critical moment. Other crimes are drawing much needed resources from the investigation. Jock takes too long to discover his team is close to disintegrating.

The final curtain. The investigation team know they are dealing with mad dogs who are unlikely to come in quietly. The raid, then the interrogations have to come off with lightning precision as they race against time to charge the bombers.