This book was a royal pain (see what I did there) 
 So it starts off with Celaena Sardothien (awesome name, right?) a female assassin, the GREATEST assassin. She gets shipped off to the kingdom and the king wants an assassin, but it's not going to be that easy, just picking one off the street. The king holds a competition, one much like the Hunger Games (though a bit different) and Celaena has to win for her freedom that was promised for winning. Now, you might have heard that this had a love triangle in it, and yes indeed it does: Chaol and Dorian. Dorian is the sweet, fun, kind-no-matter-what kind of guy (the Jem Carstairs of the TOG series) and then there is Chaol, the "Team Jacob" of the TOG series. By Team Jacob, I mean that Chaol will not end up with Celaena. 
 Theory! (has subtle Heir of Fire and Crown of Midnight spoilers and possible Queen of Shadows spoiler 
 In Throne of Glass, she gets close to Dorian, but pushes him off at the end. Then, in Crown of Midnight, she practically THREW herself at Chaol. In Heir of Fire, neither of the guys where present. So, that means she will either go back and forth with the two guys until the 6th book, (Going in this order: Dorian, Chaol, Neither, Dorian, Chaol, Neither. In the epilogue of the last "neither" the final decision might be made)OR, one of them will die (hopefully Chaol) and the rest of the books will drag on with Dorian/Chaol and Celaena saving the universe.