Key to the past

"Celia Fincastle is headed back to Renasci, ready for another year. This time she has to complete her family tree, but she doesn't have much information to work with. Help comes from an unexpected source, but it's hidden by a series of clues, and Celia soon learns she's not the only one searching. Time is running out, and both her grade and her future hang in the balance - will she find it in time?"--Amazon.com