The Ghost Sonata by Jennifer Allison

Gilda Joyce's best friend, Wendy Choy, is chosen to participate in a piano competition in Oxford, England, so of course super-sleuth Gilda finds a way to go too. Once there, the grueling practice schedule takes a backseat to strange and spooky occurrences. There are foreboding tarot cards that keep appearing to the participants and ominous numbers etched in frosty windowpanes. But even more chilling are Wendy's ghostly nightmares of a young boy?and the haunting melody she can't shake out of her mind. Could there be a sinister connection to the piano competition? Gilda has a genuine haunting on her hands, and solving this one will take every ounce of psychic intuition she's got

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