Two truths and a lion

"Sadie and her friends should be preparing for end of the year finals but they are about to go on a mission to save one of their own. She was taken from school and they know just where to find her. Things are all going according to plan. But suddenly there's a new girl at school--with the same powers as Sadie--who claws her way into The Pack. But this girl is fiercly confident and soon wants to lead them her own way"--Provided by publisher.