The Mediator #2: Ninth Key by Meg Cabot

The Ninth Key is the second book in the thrilling, romantic Mediator series, from the New York Times bestselling author of the Princess Diaries, Meg Cabot. 

Everything is going great for Suze. Her new life in California is a whirlwind of parties and excellent hair days. Tad Beaumont, the hottest boy in town, has even asked Suze out on her very first date. Suze is so excited that she's willing to ignore her misgivings about Tad...particularly the fact that he's not Jesse, whose ghostly status—not to mention apparent disinterest in her—make him unattainable.

What Suze can't ignore, however, is the ghost of a murdered woman whose death seems directly connected to dark secrets hidden in none other than Tad Beaumont's past.

Don't miss the delightfully funny supernatural Mediator series, from New York Times bestselling author Meg Cabot.