The Agency, book 2
You know you are loving a series when to finish a book and are seriously tempted to start it again immediately because you don't have the next one yet but you want more.
I love these books. Are they perfect? No, I'm sure they're probably not, but I absolutely love them.
Read the first one first-- A Spy in the House-- and then this one.
Looking forward to reading the third as soon as I can get my hands on it. In the meantime... maybe it's time to reread the Robin Paige Victorian mysteries?