As noted, author Kevin Sullivan (not the wrestler) is currently working on a book about The Undertaker, which will cover the character and storylines but not the man behind the gimmick.

The name of the book will be "Undertaker: 25 Years of Destruction" and it will be released on November 3rd. Below is the synopsis:

See The Deadman like you've never seen him before!

With stunning visuals and in-depth commentary, Undertaker: 25 Years of Destruction takes the reader deep into the darkness, where few dare to tread! Learn everything you need to know about sports-entertainment's mysterious grim reaper of justice with this massive hardcover tome.

Coverage includes:
• Stunning Visuals
• In-depth Discussion of Undertaker's rise within the WWE ranks
• Exclusive Interviews with Superstars, Announcers, and other WWE personalities
• Behind the Scenes Look at Undertaker's Historic Streak