Book titles for The Dark Artifices

You must have noticed that all The Mortal Instruments books start with City of ________, and all The Infernal Devices start with Clockwork _________. I guess this time Cassie is mixing it up, the three books of The Dark Artifices will be called in this order: 

• Lady Midnight,
• Prince of Shadows,
• and The Queen of Air and Darkness

There's nothing much in common in the titles except that they all contain a type of person (Lady, Prince, Queen) or perhaps it's the use of "dark" words (Midnight, Shadows, Darkness).

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