E.M.M.A.

Aria, Meredith, Elie, and Madison have almost nothing in common.
Aria is one of the most popular girls you could ever meet. Being the most pretty cheerleader brings a lot of popularity (and boys). Everyone knows her name and outsiders desperately try to get in with her but she never lets them. She only hangs out with the inner circle, as the high schoolers at Tomridge high call it.
Meredith is a loner who would rather keep to herself than talk to anyone. You can often find her nose stuck in a book. She is a rather clumsy girl but that just adds onto how cute she is. Although she is ditzy she has a good heart.
Elie is the smartest girl in her grade. She is constantly bombarded by people trying to copy answers off her homework and people looking for a tutor. She helps them only in exchange for information. Behind the scenes she sells information on teachers and other students to all those who seek it. She does so secretly and goes by the code name E.
Madison is that one girl who is on Varsity soccer, Varsity Volleyball and Varsity Basketball. She is on the top of her game and has already been offered five scholarships in her Junior year. Secretly she doesn't like playing competitive sports but is pressured into it by her athlete friends. All she wants to do is just do well in high school and move on from that chapter in her life.
Like I said, these girls have almost nothing in common, except for one thing. Lia. They were all Lia's best friends before she got kidnapped. After Lia was rescued over the summer she got put into therapy by her worried mom. During therapy Lia talks about her best friends and how thinking of them helped her cope with surviving her kidnapping.