Little Thieves (Little Thieves, #1)

by Margaret Owen

All in all, he gives the impression of a collection of billiard cues that unionized to solve crimes.

“I wanted to say hello again,” Ragne continues, smiling very toothily, “and to tell you it’s my job to look after the Vanja, even though she is mean. If you hurt her, I will turn myself into a bear and kill you. That’s all. Goodbye!”