The first four chapters of Percy Jackson are about
1: The introduction of his character to the book
2: The introduction of his personality, his friends and family.
3: Him being attacked by Ms. Dodds.
4: Him being taken to Camp Half Blood.
5: Him being attacked by the minotaur and having his mom die.
6: The introduction of Annabeth Chase
Also, read the dam percy jackson books! They're so good!