Tree forts, maple trees and roaring lions? When their classmate Yusuf hears ferocious roaring lions and creepy laughing hyenas in his backyard, he calls the best detectives he knows, Ibrahim and Zayn Khan! With the help of their trusty brown sack, they search for clues and bit by bit piece together this extraordinary mystery. Join the 3rd grade detective duo as they solve the thrilling case of The Roaring Lion!