Meyer's Twilight books have been made into success Hollywood movies
Twilight author Stephenie Meyer's next book will be put online for free for all her "supportive fans" to read, she has announced.
The Short Second Life Of Bree Tanner will go on sale in shops on 5 June and be made available online days later.
In a statement on her website, Meyer said she had never planned to publish the short story.
"You all have bought a ton of my books, and I wanted to give you this story as a gift," she said.
"I'd always considered The Short Second Life Of Bree Tanner as something for the fans. They have been so supportive of all things Twilight."
Meyer's Twilight series of vampire novels have sold about 100 million copies worldwide and have spawned a successful film franchise, starring Robert Pattinson and Kristen Stewart.
The new novella is told from the point of view of Bree, a character originally featured in the third Twilight book, Eclipse.
"Actually, this has been a surprise to me too. The reason why it's a surprise was that I never intended to publish this story as a stand-alone book.
"I began this story a long time ago before Twilight was even released," Meyer said.
One dollar from each book purchased in the US will be donated to the American Red Cross while anyone who reads the story online will be asked to donate to the charity.