All Fall Down (Ally Carter)

I don't mean to get into trouble. Trouble just sort of finds me.

Grace has been shipped off to stay with her diplomat Grandpa in the glittering Embassy Row, a place where trespassing into the wrong garden can cause an international incident. Grace knows the rules - she's ignored them before - but however much she wants to change, she can't. Not while she's certain of three things:

1. She isn't crazy.
2. Her mother was murdered.
3. Someday she's going to find the man with the scar, and then she is going to make him pay.