I'm glad to say, this is very interesting series. I'm more surprised that its a harlequin book. 
 From the title, I was worried that it was one of those steampunk YA novels (I was in steampunk last month) and I was pleased that it was a sidhe genre storyline (I didn't read the synopsis shh...) 
 I think this is the first book that altered sidhe courts by adding Iron fey in it. 
 The only problem is that made me confused. Does Ash and Puck look like a 'boy' in the book? In my mind eye, they were young adults (tall, lean, muscular, stubbly)... but definitely not a 'boy'. I seriously doubt immortal sidhe look like a boy. But considering Meghan is a 16 year old and so I let it pass. 
 BTW, the book is perfect with additional songs; Oren Lavie's A Dance 'round the Memory Tree (a bit ethereal don't you think?) and Nine Inch Nails's At Heart of it All (my favourite all time steampunk soundtrack).