Camp Half-Blood Chronicles is a media franchise created by author Rick Riordan, encompassing three five-part novel series, two short-story collections, two myth anthology books, a stand-alone short story, three crossover short stories, an essay collection, multiple guides, seven graphic novels, two films, a video game, a musical, and other media. Set in the modern world, it focuses on groups of demigod teenagers, and features many characters from Greek and Roman mythology. The first series, Percy Jackson & the Olympians, follows the adventures of a teen named Percy Jackson at a summer camp for Greek demigods. The second series, The Heroes of Olympus, introduces several more lead characters and a second camp for Roman demigods named Camp Jupiter. The third series, The Trials of Apollo, follows the now-mortal god Apollo, with appearances by many characters from the first and second series. The franchise takes place in the same fictional universe as two of Riordan's other series, The Kane Chronicles (which centers on Egyptian mythology) and Magnus Chase and the Gods of Asgard (set in the world of Norse mythology). Three short stories have been published which join The Kane Chronicles and the Camp Half-Blood Chronicles; Camp Half-Blood characters have also appeared in both the Magnus and Kane books. Source: Wikipedia (en)