The Lightning Thief

The Lightning Thief is the first book of series Percy Jackson and the Olympians, abbreviated to PJO, about a twelve-year-old demigod named Percy Jackson who finds out he is a son of Greek god Poseidon, and has to return Zeus's stolen master bolt with two companions, Annabeth Chase and Grover Underwood. The Oracle of Delphi gives a prophecy on their quest:

"You shall go west and face the god who has turned.

You shall find what was stolen and see it safely returned.

You shall be betrayed by one who calls you a friend.

You shall fail to find what matters most, in the end."

The trio travels to the Underworld and blame Hades for stealing it. Hades blames them for stealing his Helm of Darkness. Deep inside, Luke Castellan has stolen the bolt to get Percy killed. He sparked the idea in Ares, god of war, to help him on his quest. In the end, they fail to save Percy's mom, Sally Jackson. But Hades returns her anyway because his helm was returned. It's a journey to find out Percy Jackson's real identity. But underneath, the evil Titan Kronos is stirring from his remains in Tartarus... and a son of the Big Three gods that will turn 16 first will either destroy or save Olympus. The war is nearing, and this quest is only the beginning.