The Mediator by Meg Cabot

Meet Susannah "Suze" Simon. A girl who looks and sounds and acts like any normal girl. Origionally living in New York City, she has to move to a small town called Carmel Hills, in northern California, after her mom remarries her step-father, and giving her three new step-brothers; Jake (Sleepy, 12th Grade), Brad (Dopey, 10th Grade), and David (Doc, 8th Grade). With problems of a normal teenage girl (make-up, boys, friends), she has another one. A problem, a responsibility, a commitment she didn't sign up for. Suze Simon is a mediator. What's a mediator? It's a person who can communicate with people who have died before they have finished what they started on Earth before they get to go to the next world. Basically, she can talk to ghosts, and she has to help them. Enter: Heather. She committed suicide because her boyfriend dumped her, and she's out for revenge. Suze has to continuously save the ex, stop Heather, and focus on the hot, 150-year-old ghost Jesse, and his mysterious death. He also lives in her room. Or did I forget to mention him......You have to miss me, -Me - BookLuver-