The Spellman Files by Lisa Lutz

Izzy Spellman grew up and joined the family business and her little sister is following in her footsteps. This has her family concerned since Izzy was quite the hellion as a child and because the Spellmans are Private Investigators. Anecdotes will keep you laughing as Izzy explains how she met each of her ex-boyfriends, how she and her best friend terrorized the neighborhood growing up and how she plans to find her little sister when it becomes clear that Rae has been kidnapped.