The Heroes Of Olympus: The Demigod Diaries is a collection of four short stories about demigods from the world of Percy Jackson. It includes previously unpublished stories about Percy Jackson, Leo Valdez, and other beloved characters. With a bonus story featuring Percy's best friend, Grover Underwood, this book is a must-read for any fan of the series. The Demigod Diaries also includes interviews, character profiles, and illustrations from the world of the Heroes Of Olympus. This book is perfect for fans who want to dive deeper into the world of demigods and their adventures.