The Class Project-How to Kill a Mother: The story of Canada's Infamous Bathtub Girls

This is the true crime book that the movie "Perfect Sisters" was based on. A frantic 911 call led police to a townhome in suburban Toronto, Canada after sisters, aged 16 and 15, reported finding their alcoholic mother dead in their bathtub. It seemed like a tragic accident but what police didn't know at the time was that the girls were cold-blooded killers, who had planned their mother's murder with help from their friends.