Do you remember the Son of Sobek where Rick Riordan crossed over Percy Jackson and The Kane Chronicles? Well, he's doing it again! This time with Annabeth and Sadie. The short story will be called The Staff of Serapis and, per usual, take place in New York. It will be released on the 8th of April in the US paperback edition of Mark of Athena, and sometime after that will be available as a separate ebook. It about 60 printed pages long, according to Riordan's blog.
Click here for the sneak peak at the new story!