this audiobook is not an original version made by Rick Riordan/actual publishers, but you'll find it very good. at first, it might sound weird as maybe the spells or the characters names don't sound as you thought they would, or maybe their voices don't.
this recording was originally made by rye-n and the original version is available on www.rye-n.com
this one was re-uploaded on youtube by RJODYSSEY. there are many parts of it. each part hold more-or-less half a chapter.
to find: type 'red pyramid' in the search box and click on the one that says 'the Red Pyramid audiobook part 01)