This book was first published in 1963 and rewritten in 1996 and published again under the same title. See the information in the book explaining this:
Year of the Tiger was first published by Abeland Shulman in 1963 under the authorship of Martin Fallon. The book went out of print very shortly after its first publication, was never reprinted and never appeared in paperback.
The author was in fact Jack Higgins. Martin Fallon was one of the pseudonyms he used during his early writing days. In 1994, it seemed to the author and his publishers that it was a pity to leave such a good story languishing on his shelves. So Jack Higgins has created an entirely new framework to the original book, added some scenes and made some changes throughout. We are delighted to be able to bring back Year of the Tiger for the pleasure of the vast majority of us all who never had a chance to read the original edition.