“I just a mother very calmly admit to murdering her twelve year old daughter” 

A Mothers Betrayal 
The Murder of Karissa Boudreau and the RCMP Investigation That Uncovered The Truth
By John Elliott 

I can still vividly remember when this happened, I was in grade 12 when this young girl was believed to have run away, only the truth was so much worse. This book talks about the case and the undercover operation to bring the truth to light and get justice for twelve year old Karissa Boudreau.