I have read the first two books in the series. The "Republic of Thieves" isn't available in german yet and I am not in the mood now to read it in english, because I have so many other books to read first.
It was a cool, venetian-like Fantasy, refreshingly it wasn't another "medieval" setting. The conversations between the characters were entertaining and the story had enough surprises and turning points to enjoy the whole plot. I were not very emotional attached to the characters, but Locke's schemes and the interesting locations and persons made up for it.
It was a very good read for relaxing saturday afternoons in the summer, sitting in the garden and sipping some cool drink.