The Staff of Serapis is a short story about 60 pages long about the meeting of Sadie Kane (from author Rick Riordan's The Kane Chronicles series) and Annabeth Chase. The release date is set for April 8th, 2014.
Annabeth has just finished a job interview for a summer internship (which she thinks she did poor on) when she sees a strange monster in the middle of New York. It appears to be a wolf and a lion combined into a cone shaped shell. The monster eyes her and looks as if it is about to attack, but then turns and leaves. Annabeth instead of going to Percy Jackson's apartment, follows the monster.