House of Hades is hitting store shelves in paperback form, and it will contain an added bonus.

Yesterday morning, author Rick Riordan announced that The House of Hades, the fourth installment in the Heroes of Olympus series, will be released in paperback form on March 31.

The paperback edition of House of Hades will also contain the short story “The Crown of Ptolemy.” This story will be the third — and final — crossover adventure featuring characters from the Percy Jackson series and the Kane Chronicles series.

Riordan explains in a followup tweet that, unlike the previous two short stories, this one will contain all four characters: Percy Jackson, Annabeth Chase, and Sadie and Carter Kane. It will be told from Percy’s point of view, which is something fans have been missing from Riordan’s more recent books, as they’re narrated by a whole host of demigods.

These crossover short stories are always released in the back of the paperback edition of one of Riordan’s novels, but they are also later released as eBooks for those that may already own the hardcover version and don’t want a second copy of the book.

Better yet, Riordan also states that there are plans to combine the three stories into one book, though there are no details about that just yet.

Riordan will be releasing a coffee table book titled Percy Jackson’s Greek Heroes on August 18. You can read the synopsis here, as well as check out the beautiful cover, illustrated by John Rocco.

The author’s next series, Magnus Chase and the Gods of Asgard, will debut in October of this year with the first novel, The Sword of Summer. The trilogy will take place in Boston and focus on Norse mythology.

Are you excited for ‘The Crown of Ptolemy’?