Cam Jansen: the Ghostly Mystery #16

Cam's on line to buy tickets for a concert, but now she's got more than she bargained for -- a new mystery to solve! Someone dressed as a ghost is scaring people on line. Is he also stealing their wallets? Cam thinks so, but she's got to rely on her amazing photographic memory to un-mask the thief. "Adler delivers another satisfying story."-- "School Library Journal"