An unpublished book by Robert A Heinlein has been reconstructed from notes and typed manuscript pages left behind by the Hugo award-winning author, The Guardian reported. 

According to the source, this book provides a completely new ending to the author’s novel The Number of the Beast.

Robert Heinlein was a major figure in 20th-century science fiction. He is the author of works including Starship Troopers, Stranger in a Strange Land and The Moon Is a Harsh Mistress.