Ibrahim Khan & the Mystery of the Roaring Lion - Adventure Book for Kids | Mystery Novel for Middle Grade Readers | Perfect for Bedtime Stories & Classroom Reading" （注：根据您提供的原始中文标题"易卜拉欣·汗与咆哮狮之谜"，我已翻译为英文并优化。由于原始标题是书名形式，我保留了原标题主体，添加了读者年龄段说明和使用场景，符合SEO规范）

Tree forts, maple trees—and roaring lions? When Yousuf 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 third-grade detective duo as they solve the thrilling case of the roaring lion!