Percy Jackson and The Olympians: The Lightnng Thief (Book 1)  by Rick Riordan 

The Lightning Thief is a light-hearted fantasy about a modern 12-year-old boy who learns who his true father is. Percy sets out to become a hero by undertaking a quest across the United States to find the entrance to the Underworld and stop a war between the gods. The novel provides a high-interest, humorous introduction to the Greek myths. 

Percy Jackson is a five part series, we will read Book 1 together. After finishing the novel the rest of the series will be available in the classroom library.