When television news reporter Hope Martin (Lynda Boyd) breaks a story about mercy killing, Detectives Leary and Shannon start digging around for more details, and Da Vinci calls a Coroner's Inquest to force Martin to reveal her source. The issue of euthanasia is divisive and as the investigation proceeds Da Vinci finds himself at odds with the police and his superiors about the reality and the ethics of what happened. His elderly father's recent debilitating stroke further complicates his response.

Danny Leary is back in town, but the reunion with his older brother Mick is far from idyllic. It looks like he is hooked on drugs and, unbeknownst to Mick, hanging around with two hoods that turn up dead.

The Coroner's office investigates the cause of a devastating fire at a seniors' care facility that left most of the residents dead and an elderly man missing. Arson or accident may have caused the fire but while he investigates with Chief Fire Investigator Henry Whiteside, Da Vinci uncovers evidence of abuse at the home. The harsh realities of caring for the elderly are brought into sharp focus by his own mother's increasing inability to care for his father alone.

Mick's partner Kosmo and his brother Danny have struck up a friendship that has the potential for a romance. Danny's club looks like it might get off the ground, although his business partners appear to be mob-connected.