Undrowned

"Samantha and Rachel used to be friends. But then Rachel betrayed Samantha ... and Samantha decided to make her life a living nightmare. Then one day, Sam and Rachel found themselves in a fight by a lake. Samantha pushed Rachel ... and watched as Rachel fell back. And back. Into the water. And gone. No way to save her. No way she could be alive. The next day, Rachel shows up to school as if nothing happened. And now she's the one who wants to make her former friend's life a living nightmare"--