Amazing series. Magical, dangerous, cruel ...sexy. I've never read an adult fairy tale that would make me feel again like a little girl reading dark tales of H.C. Andersen for the first time.
I do have to say I never really cared for the third installment, but that was only because there was too much hurt and it was drawn out beyond my love of hurt/comfort. Not my thing.
Don't read out of sequence or as stand-alones.