Percy Jackson and the Olympians
Reading Order.

After a year spent trying to prevent a catastropic war among the Greek gods, Percy Jackson finds his seventh-grade school year unnervingly quiet. His biggest problem is dealing with his new friend, Tyson--a six-foot-three, mentally challenged homeless kid who follows Percy everywhere, making it hard for Percy to have any "normal" friends. But things don't stay quiet for long. Percy soon discovers there is trouble at Camp Half-Blood: The magical borders which protect Half-Blood Hill have been poisoned by a mysterious enemy, and the only safe haven for demigods is on the verge of being overrun by mythological monsters. To save the camp, Percy needs the help of his best friend, Grover, who has been taken prisoner by the Cyclops Polyphemus on an island somewhere in the Sea of Monsters--the dangerous waters Greek heroes have sailed for millenia--only today, the Sea of Monsters goes by a new name...the Bermuda Triangle. Now Percy and his friends--Grover, Annabeth, and Tyson--must retrieve the Golden Fleece from the Island of the Cyclopes by the end of the summer or Camp Half-Blood will be destroyed. But first, Percy will learn a stunning new secret about his family--one that makes him question whether being claimed as Poseidon's son is an honor or simply a cruel joke.

When Percy Jackson gets an urgent distress call from his friend Grover, he immediately prepares for battle. He knows he will need his powerful demigod allies at his side, his trusty bronze sword Riptide, and…a ride from his mom. The demigods rush to the rescue to find that Grover has made an important discovery: two powerful half-bloods whose parentage is unknown. But that’s not all that awaits them. The titan lord Kronos has devised his most treacherous plot yet, and the young heroes have just fallen prey. They’re not the only ones in danger. An ancient monster has arisen—one rumored to be so powerful it could destroy Olympus—and Artemis, the only goddess who might know how to track it, is missing. Now Percy and his friends, along with the Hunters of Artemis, have only a week to find the kidnapped goddess and solve the mystery of the monster she was hunting. Along the way, they must face their most dangerous challenge yet: the chilling prophecy of the titan’s curse.

Percy Jackson isn't expecting freshman orientation to be any fun, but when a mysterious mortal acquaintance appears, pursued by demon cheerleaders, things quickly go from bad to worse. Time is running out for Percy. War between the gods and the Titans is drawing near. Even Camp Half-Blood isn't safe, as Kronos's army prepares to invade its once impenetrable borders. To stop them, Percy and his friends must set out on a quest through the Labyrinth -- a sprawling underground world with surprises and danger at every turn. Along the way Percy will confront powerful enemies, find out the truth about the lost god Pan, and face the Titan lord Kronos's most terrible secret. The final war begins . . . with the Battle of the Labyrinth. - Publisher.

Most people get presents on their sixteenth birthday. I get a prophecy that could save or destroy the world. It happens when you're the son of Poseidon, God of the Sea. According to an ancient prophecy, I turn sixteen and the fate of the entire world is on me. But no pressure. Now Kronos, Lord of the Titans, is beginning his attack on New York City. And the dreaded monster Typhon is also heading our way. So it's me and forty of my demi-god friends versus untold evil . . .

The original heroes from The Lightning Thief are reunited for their biggest challenge yet: getting Percy to college when the gods are standing in his way. After saving the world multiple times, Percy Jackson is hoping to have a normal senior year. Unfortunately, the gods aren't quite done with him. Percy will have to fulfill three quests in order to get the necessary three letters of recommendation from Mount Olympus for college. The first quest is to help Zeus's cup-bearer retrieve his goblet before it falls into the wrong hands. Can Percy, Grover, and Annabeth find it in time? Readers new to Percy Jackson (this book can be enjoyed as a standalone) and fans who have been awaiting this reunion for more than a decade will delight equally in this latest hilarious take on Greek mythology.

It is the book number 7.