In a town where gossip thrives like the ivy that clings to its mansions, where mysteries lie behind manicured hedges and skeletons hide in every walk-in closet, four perfect-looking girls aren't nearly as perfect as they seem. Three years ago, Spencer, Aria, Emily, Hanna, and their best friend Alison were the girls at Rosewood Day School. They clicked through the halls in their Miu Miu flats…