The House of Hades is the fourth book in the Heroes of Olympus series and it definitely has the best cover. Its so.....Percabeth<3. Jason and Piper were useless as usual, but what else is new? Also, we get a new ship, which I LOVE because 7 is an odd number and I was kind of hoping that it would be Jason that ends up forever alone. The ending is the least cliffhanger-y out of all of them, which is really surprising, because we all know Uncle Rick. He probably has this great big pythos at home full of cliffhangers that he pulls out every time he ends a book. 
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