The Lightning Thief Series, by Rick Riordan, is about a boy, Percy (short for Perseus) Jackson, who learns that his real father is Poseidon, the Greek god of the sea.
In book 1, The Lightning Thief, Percy is in 6th grade when he gets attacked by a mythological creature of the Underworld called a Fury. He also gets attacked by a Minotaur a half-man, half-bull creature. After that he came to a place called Camp Half-Blood where finds out his best friend, Grover, is a satyr, a half-human, half-goat creature, that the camp is for people like him, half-human, half god. He is also offered a quest, one that will decide the fate of the world.
In book 2, The Sea of Monsters, Percy returns to Camp Half-Blood is in danger because someone poisoned the camps magical borders which keeps all he mythological monsters outside of camp. He also finds out that Grover has been captured by a cyclops. Percy must save his friend and Camp Half-Blood or else they are all doomed.
In book 3, The Titan's Curse, Percy receives an urgent distress call from Grover saying that he found 2 half-bloods and needs to get hem safely to camp. But, a Greek goddess, Artemis, has bee captured by a mysterious evil. To rescue the goddess Percy tarts a perilous quest.
In book 4, The Battle of the Labyrinth, Percy discovers a maze that could
help their enemies get into Camp Half-Blood. So Percy goes into the labyrinth, on a quest to find it's creator so they can destroy it, a quest that nobody has come back from alive.
Book 5, The Last Olympian, is now available where ever books are sold.
My Opinion
In my opinion The Lightning Thief series is a great at book. I liked it not only because it was funny, but because I love Greek mythology.
For extra unknown adventures check out The Demigod Files.
Website
Percy Jackson Books