Best-selling author Rick Riordan presents ten new stories--including one of his own--about beloved heroes that sprang from the imaginations of some of the best middle grade authors working today.

A cave monster . . . an abandoned demon . . . a ghost who wants to erase history . . . a killer commandant . . . These are just some of the challenges confronting the young heroes in this highly entertaining anthology.

All but one of the heroes previously starred in a popular book from Rick Riordan Presents. You'll be reunited with Aru Shah, Zane Obispo, Min the fox spirit, Sal and Gabi, Gum Baby, Nizhoni Begay, Paola Santiago, Sikander Aziz, and Riley Oh. Who is the new hero? Read Rick Riordan's short story to find out!

Ten bestselling and award-winning middle grade authors contributed to this collection- Roshani Chokshi, J.C. Cervantes, Yoon Ha Lee, Carlos Hernandez, Kwame Mbalia, Rebecca Roanhorse, Tehlor Kay Mejia, Sarwat Chadda, Graci Kim, and Rick Riordan, who also served as the editor.

The cultures represented by these own-voices stories are- Indian, Mesoamerican, Korean, Cuban, Black American, African, Navajo, Mexican, Mesopotamian, and Celtic.