The Demigod Files is a collection of three short stories that are part of the Percy Jackson and the Olympians series by Rick Riordan. The book focuses on various adventures and events related to the demigod characters from the series.

The first story in the collection is titled "Percy Jackson and the Stolen Chariot" and follows Percy Jackson and Clarisse as the two of them must find Ares' chariot that Phobos and Deimos have hidden away.

The second story in the collection is titled "Percy Jackson and the Bronze Dragon" and introduces the demigod character of Charles Beckendorf. It follows Beckendorf and Percy as they team up on a quest to find a stolen weapon called the Bronze Dragon.

The third story in the collection is titled "Percy Jackson and the Sword of Hades" and makes Percy an unwilling character in the creation of Hades' sword by Persephone.

In addition to the three stories, The Demigod Files also includes various bonus materials, such as character profiles, interviews with the author, and activity pages. This book serves as a companion to the Percy Jackson and the Olympians series, providing fans with additional content and backstory.