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What's this book called (read description)?

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I've been thinking about a series of books i read around about 5-6 years ago, but i can't remember the titles at all and it's driving me crazy!! I can remember some of the details though. The first book started where a boy who had an illness of some kind (maybe leukemia??) fell asleep holding a notebook his dad had given him. When he woke up he was in a city a little bit like venice. I remember in the book all the unmarried young woman wore masks. And the city was ruled by a woman. There were 4 books in the series, the titles might have been "city of " somthing but i can't remember!! I know i definetly read these book and I DID NOT IMAGINE THEM!!!