The Lightning Thief by Rick Riordan
Chapter 18: Annabeth Goes to Obedience School

Percy, Annabeth, and Grover finally enter the Underworld by way of Percy’s very own plan. Thankfully, the Underworld does not look like the stereotypical version of Christian Hell. It’s just an endless amount of bureaucracy–which is arguably worse.

The Lightning Thief by Rick Riordan
Chapter 17: We Stop for Water Beds

While this entire series shows how strange and dangerous being a half-blood is, this chapter is the first to really cement that fact for me.
Percy’s in L.A. for a couple of minutes and immediately gets into a conversation with a Nereid in the Pacific Ocean while testing out his powers–powers that allow him to see clearly in seawater and actually see cold and warm currents (I don’t think this power ever comes up again).

The Lightning Thief by Rick Riordan
Chapter 16: We Take a Zebra to Vegas

This is a strange chapter. It is simultaneously the most forgettable chapter and one of the most memorable (for me anyway), and the memorable part is only a small part of the whole chapter.

The Lightning Thief by Rick Riordan
Chapter 15: A God Buys Us Cheeseburgers

A particularly long chapter compared to the previous ones so far; chapter fifteen is comprised of three separate scenes that could have been their own chapters, but thankfully weren’t so I have less chapters to review.