My favorite book is The Lightning Thief. It's the book that started it all. It turned out into a whole series and a continuing, whole other line of books. Percy Jackson found out his dad was actually Poseidon, that meant he was a demigod. So, he went to a place called Camp Half-Blood. There, he and other demi gods train to fight monsters. But, when his mom is taken by a minotaur on his way to Camp Half Blood, Percy found out during a campfire. He thought she was dead.
Percy decided to go on a journey to find his mother. A guy named Luke gave him flying shoes and a shield. His newly made friend Annabeth, and his best friend Grover, the one who told him about the camp, insisted he didn't go. But he said he had to so they went together. Also, Percy is accused of taking Zeus' Thunderbolt! They meet the God of War, Ares, on the way and Percy ignores him. Ares told Percy to give back the lightning bolt. But Percy insists that he doesn't have it. They leave and get the last pearl.
They go through the Gates of Hades to get Percy's mom back. There they find out the shield Luke gave him had the lightning bolt in it. They rescue Percy's mom and have to leave Grover behind. They got to Mt. Olympus and explained it was Luke. Zeus rescued Grover from the Underworld and the book ends. Those were the important parts of the book. It continues into a series. Then Rick Riordan releases a new series called "Heros of Olympus," it's a continuation of this series. That's why this is my favorite, this is the book that started it all.