I'm on book 3 of series 2. Took me ages to find it at the library, but I don't care if you give me spoilers. (I'm one of those people who read the last chapter of a book to find out what happens.)
Not to spoil or anything, but I was going to say that Nico and Reyna would have made a cute couple. Maybe this sounds spontaneous, but you have to read "Blood of Olympus" to know what I'm talking about.