Percy Jackson and the Lightning Thief.

In this book, Percy Jackson gets attacked by Mrs. Dodds, who is really a fury. She said he had stolen the master bolt. But hi didn't. He soon discovers that he is a half god half man, called a demigod. His mom gets sent to Hades, God of the dead. Percy also finds out that someone has stolen Zeus most powerful weapon, the master bolt, or there will be a huge war between the gods. So now, he must go to Hades himself and try to get back his mother, only to find out that he also now must find the Helm of Darkness returned to get his mother back and give the master bolt back to Zeus, all by the summer solace. But the prophecy says that a friend will betray you, but who? It also says that you will will fail to what matters the most, which is not good.