The Lightning Thief by Rick Riordan

Percy, expelled from six schools for being unable to control his temper, learns the truth from his mother that his father is the Greek god Poseidon, and is sent to Camp Half Blood where he is befriended by a satyr and the demigod daughter of Athena who join him in a journey to the Underworld to retrieve Zeus’s lightning bolt and prevent a catastrophic war.

Liz says:

“Wow! What a great story. This is the first in the Percy Jackson & the Olympians series and it’s a winner. (This is a five book series, three more of which are already published: Sea of Monsters, The Titan’s Curse and The Battle of the Labyrinth.) There’s lots of adventure, lovable characters and tons of Greek Mythology. Absolutely everyone is loving this series. BTW- there is a movie coming out!”