Pretty Little Liars (2010)

Inspired by Sara Shepard's young adult novels, Pretty Little Liars delves into the lives of four high school friends—Spencer, Hanna, Aria, and Emily—who struggle to cope with the mysterious vanishing of their leader, Alison. A year later, their fragile bond is tested when they start getting ominous messages from an unknown sender known as "A." This shadowy figure promises to reveal their deepest secrets, including those they believed were buried alongside Alison. Tensions rise as the friends navigate trust, betrayal, and the haunting past that continues to haunt them.