The Staff of Serapis

''This article is about the short story featuring Annabeth Chase and Sadie Kane. For the title item, see Serapis's Staff.'' The Staff of Serapis is the sequel to The Son of Sobek. Annabeth Chase and Sadie Kane meet in this story. The story is set to be released on April 8th, 2014 with the paperback version of The Mark of Athena. The e-book is expected to come out on May 20th, 2014. The cover was released April 3rd, 2014 in a live interview with Rick Riordan.

Synopsis
In this adventure, Annabeth encounters more oddities in the subway than usual, including a two-headed monster and a younger blond girl who reminds her a little of herself...

This is the story fans have asked for, in which Annabeth Chase teams up with Sadie Kane.The demigod daughter of Athena and the young magician from Brooklyn House take on a larger-than-life foe from the ancient world. Perhaps even more disturbing than the power-hungry god they encounter is the revelation that he is being controlled by someone-someone all too familiar to Sadie. The audio narration was recorded by Rick Riordan himself. As a special bonus, the first chapter of The Blood of Olympus, the final book in The Heroes of Olympus series, is included.

Plot
Annabeth Chase is on the subway to Percy Jackson's apartment, after flunking an interview, when she sees a strange monster, a lion and a wolf stuffed into a repaired cone shaped shell. The monster bears it's fangs at her and proceeds to leave. Annabeth decides to follow the monster because usually monsters do not leave demigods alone once they have spotted them.

This monster is actually the Staff of Serapis, but the staff has been broken into pieces. Only two of the heads, the lion and the wolf, are seen by Annabeth, and the third dog head is missing.

Formats
The short story will be released in the paperback version of The Mark of Athena on April 8th, 2014. After the paperback version is released there will be an e-single and audio for the short story that is read by Rick Riordan. The e-single and audio book's expected release date is May 20th, 2014.