Well, I read the first of these (cover pictured) before I started this blog, but I just read the two sequels Flawless and Perfect. The fourth, Incredible, will be published on the 27th of May, so I guess I'll read it once it's out.
YA, obvs, and kind of I know What You Did Last Summer crossed with The Clique with a little more sex. Murder, blackmail, and mayhem. Who is A who is tormenting Hanna, Emily, Aria and Spencer?
Right now I'm guessing it's Melissa, but I am almost definitely wrong- I never guess the right murderer, even in Mary Higgens Clark, where the murderers pretty much are named Killer McStabby, so that should put Melissa in the clear, then.