The three girls never went anywhere without each other. They were besties Wel, except Biology Class - the one class that only Rachel and Sheila were in. Maybe that's why during biology Sheila would ask a lot of strange questions "Excuse me, what kind of acid would you dispose of a body in?" "I don't know..why?" "Oh, we're trying to figure out what to do with Skylar." Rachel would be off on the side giggling, That's how the two girls started to plot their best friend's murder in biology class.