When the one and only thing I can say I disliked in this book was Alexia's attitude about the suffragettes (I would have loved to see her supporting them instead), I suppose Heartless deserves its 5 stars. It's not a book everyone would love; yet, for those who get it, it's truly amazing. Others might enjoy it but not be able to see the authentic appeal. I feel bad for them.
The Parasol Protectorate has always been wonderfully witty, hilarious and creative. In addition, Heartless definitely wins at plot, secondary character development, shocking revelations and bad-ass heroine (the world needs more eight-month pregnant women being amazing and brilliant in non-pregnancy-related things).