Watch Da Vinci's Inquest

Dominic plans to announce his run for Mayor, but must outsmart interim Joyce Simkins who strongly opposes his red light proposal. A fire started at Kosmo's house may be tied to a man found immolated in his car. Mick rushes to catch his lead suspect before he slips past the border. Sue suffers an overdose in prison.

A conflict of interest is feared when Dominic looks at a constable shooting a man in self-defence at a safe injection site. Kosmo begins working with Suki in robbery, but receives optimistic news when she hears that the Crown is dropping some of Brian Curtis' cases. Both Mick and Rose catch big breaks in their respective cases.

Dominic gets backing to help persuade him to run in the Mayor's place. Rose and Curtis investigate the death of a drug counsellor, a key witness in the Sue Lewis case. With a lead gone, Mick continues to try and uncover his friend's murder by approaching a DEA agent.

Dominic tries to chase a body down in the sewers while the Mayor's time in office runs low. Kosmo finds out that Kurtz failed to pass down a piece of information to her on the missing women case. Curtis is bumped to homicide and tagged with Rose as Leo begins a hotel security job.

The media goes into a frenzy when Dominic's red light proposal is backed up, but in the midst of it, they get wind of the Mayor's role in the hit-and-run. Rose works a case of a wife who believes her husband was killed by his co-workers. Mick and Kosmo move on to an investigate of an escort killing a client in self-defence while the Tuan siblings try to throw Mick off their trail. Leo's investigative work for Dominic quickly turns up interesting findings.

Dominic makes peace with the Mayor and Chief of Police long enough to get their support on his red light proposal. Kosmo gets the runaround in trying to talk to Sue who is being held in interrogation.

A woman found dead in her car turns out to be a private investigator looking for dirt on Dominic. Sue is arrested and the testimonies from the reliable witnesses Brian has brought forward help pins the charge of murder on her. Chick helps Mick put surveillance on the Summers' boat.

Dominic confronts the Mayor and Chief of Police to sort out their dirty dealings, but makes more progress when he talks to the Mayor's wife. Brian coerces another "witness" against Sue. Leo copes with the loss of his wife.

With Kosmo's help, Mick investigates the death of an old friend whose ship is found to be robbed of drug he was smuggling. Dominic comes across a couple of inexplicably changed stories: one from John Dunne, another covering for the mayor. Internal begins to look at Kosmo's relationship with her informant Sue.

Dominic is called to the scene of a strange case of a man found hanged off a bridge. Rose and Leo investigate the findings of a mummified infant. Dominic is suspicious when Kurtz and Jacobs simultaneously stall the Roy Cardinale case.

Dominic tries to rule on the death of the captain of a Chinese freighter, but is complicated by jurisdictional issues. Rose and Leo continue to investigate the suicide in Richard Norton's office, but are catching wind up of a cover-up. Brian Curtis begins spreading rumours on Sue.

Zack begins looking into the theft of the mayor's car while Mick and Kosmo talk to a friend of Roy Cardinale. Dominic investigates the death of a man who fell off an apartment building while attempting to steal cable. When no knife is found on Pierce's car, Curtis has to rethink his strategy.

A case of police brutality maybe linked to an accident by the train tracks while the mayor's car is involved in a hit-and-run. A man's apparent suicide occurs in a law office, but Leo and Rose can tell something is amiss. Dominic looks into a woman's death outside of a church and her connection to its priest.