A major car accident shatters the lives of several Mt Thomas families. Killed in the collision are three teenagers and Tom's wife, Nell, whose car the impaired teenagers collided with. Tom's daughter, Susan, is the lone survivor. After the unenviable task of informing the families of their losses, the Heelers shift their focus to investigating the cause of the accident. Meanwhile, the father of one of the dead teenagers files a complaint against Chris for selling alcohol to the underage kids.