The Lost Hero (Heroes of Olympus, #1)
Did you get to the the end of the Percy Jackson series and think, "Well, now what do I read?" Fear not, the story continues! The Heroes of Olympus series starts where the Percy Jackson series left off. It's got new characters and is a little confusing at first. You kind of figure out where Jason is from pretty quickly but it is not revealed completely until the last chapter. Oh and the last line.....awesome!!!! Can't wait to start the next one!!!
 - Rick Riordan)