It's been a while since I read anything in Percy's world, and I never actually finished the Apollo series, but Nico was always one of my favorites. It was strange to read this at first because they kept referencing events I either completely forgot or haven't read at all. But I really liked how this went into the difficulties in Nico and Will's relationship. The opposites attract and grumpy and sunshine tropes are popular for a reason, but it's not that easy if you and your partner are complete opposites.