Contains three crossover short stories featuring the shared adventures of demigods Percy Jackson and Annabeth Chase, and magicians Carter and Sadie Kane. Together the four heroes battle a giant crocodile, a crazed god, and an ancient sorcerer. Also includes a preview of "The Hidden Oracle."

"The Son of Sobek was first published as a short story in the paperback edition of The serpent's shadow by Rick Riordan, July 2013. The staff of Serapis was first published as a short story in the paperback edition of The Mark of Athena by Rick Riordan, April 2014. The crown of Ptolemy was first published as a short story in the paperback edition of The House of Hades by Rick Riordan, March 2015"--Copyright page. Letter from Percy Jackson -- The son of Sobek -- The staff of Serapis -- The crown of Ptolemy -- Bonus material.