The Lightning Thief is the first book in the Percy Jackson series. It is fast paced, well-written, and full of loveable, believable characters -- even if they are children of gods. This whole series is an excellent read for anyone, and a choice pick for parents who are looking for exciting, fun, clean books for both boys and girls to read.
As a school librarian, I could rarely keep this book on the shelf more than half a day. As a grandparent, I've gifted it to the grandkids, and even given copies to adult friends. It is one of those rare finds these days: a truly well-written, good book with a universal theme that still manages to be fresh.