the series. >> reporter: for readers a certain age rick riordan is a rock star. he is the author of three best selling kids' series all based on mythology. the funny thing is it all came about by accident. ten years ago riordan was just trying to help his 7-year-old son who had been diagnosed with adhd, attention deficit hyperactivity disorder and dyslexia. >> he was in a pretty precarious place when he was that age and as a parent you do whatever you can of course. >> riordan found a way to connect with his little boy at bed time. he told hailey every greek myth he could think of until he ran out of stories and started making one up, one that turned adhd and dyslexia into super human powers. >> introduced it just like one of the other stories. >> like any other story that a dad would read their kid but instead of thomas the engine he was telling me about percy jackson. >> reporter: percy jackson launched an empire. the lightning thief was made into a movie in 2010. and hard core fans have even invented summer camps based on the fictional camp half blood. >> rick