Second book of Phèdre's Trilogy, which happens almost immediately after the first one; Phèdre is living in a nice personal property, and everything's fine. Until she gets a certain package - and has to solve that mystery. At stake: the throne of Terre d'Ange, nothing less. I thought it was slightly less good than the first book, but still very nice, and a good transition between tome 1 and 3.
[EDIT] After re-reading: totally deserves the 5th star as well, actually.