A story about typical high school girls, but with a twist!

I love how the chapters switch perspectives between the two sisters Ellie and Stella. Really showing what each one is going through and thinking. They seem like your typical high school girls: sisters who compete against each other, crushes on boys, dealing with the popular girls. I’m intrigued by the mysteries though. Years ago several high school girls from the cross country team went missing and then were found dead, now the new girl Mila goes missing. Could her disappearance be a repeat of the past, or someone trying to make it look that way?