Gilda Joyce, Psychic Investigator, by Jennifer Allison, 2005

At thirteen, Gilda Joyce's star-studded careers as novelist, psychic, and spy are off to a frustrating start. When her best friend heads off to music camp, Gilda cooks up a scheme to travel to San Francisco and visit her wealthy second cousin, whose antique house just might be haunted. This could be a lucky break for Gilda Joyce, Psychic Investigator, and she and her leopard-skin disguises aren't about to miss it. Fun, absorbing, well-paced, substantial. Strongly recommended.