Former teenage runaway and new single mother Nadia Armstrong moves to Kingston to turn her life around. But six months after she rents a low-end apartment, her body is found at an isolated construction site. Major Crimes begins piecing together her last days, uncertain if it is a case of suicide or murder. To make matters more difficult, a member of the team is leaking information, putting Staff Sergeant Rouleau in a precarious position. Meanwhile, Officer Kala Stonechild's niece, Dawn, is secretly corresponding with her father, who's out on early parole and turns up in town uninvited. Dawn's friend Vanessa is also keeping a dangerous secret -- her relationship with an older man named Leo, who preys on young girls. And it's not long before he has Dawn in his sights.