Percy Jackson

From superstar author Rick Riordan's website:

 
Twelve-year-old Percy Jackson is on the most dangerous quest of his life. With the help of a satyr and a daughter of Athena, Percy must journey across the United States to catch a thief who has stolen the original weapon of mass destruction — Zeus’ master bolt. Along the way, he must face a host of mythological enemies determined to stop him. Most of all, he must come to terms with a father he has never known, and an Oracle that has warned him of betrayal by a friend. 

Once you've read The Lightning Thief, take a look at the rest of the series, or at Riordan's other fantastic series: Kane Chronicles, The Trials of Apollo, Magnus Chase and the Gods of Asgard, and The Heroes of Olympus. Then when you're done with those, check out The 39 Clues and Rick Riordan Presents books!