3.5 stars. 
 Mhmmmm. 
 I wasn't as involved with this book as I had anticipated I'd be. I liked the characters' developments (especially Nico) and I loved that they visited Malta (because I'm half-Maltese)... but that was really it. The whole plot of this novel wasn't as grand as previous books, making it much of a bridge/second book to the last book The Blood of Olympus. 
 Maybe it was that I had exams and uni to slumber through first before I could really read anymore of The House of Hades, but that still doesn't sound reasonable. 
 More to come in review. 
 I am a fan of the characters and series, but this wasn't that... hmmm. I don't know, really. 
 I am anticipating The Blood of Olympus, though, because how The House of Hades introduced what may occur subsequently, there's a lot more to anticipate.