Publisher Ian Wishart says a new book will finally solve the infamous Marlborough Sounds murder case.
Wishart will next week publish the book, Elementary -- The Explosive File on Scott Watson and the Disappearance of Ben and Olivia. The book looks at the disappearance of Ben Smart, 21, and Olivia Hope, 17, in the Marlborough Sounds on New Year's Day, 1998.
Scott Watson was convicted of their murders in May 1999 and remains in prison. He has denied any involvement in their disappearance and death.
The remains of Smart and Hope have never been found.
Wishart said he was "pitching" the book as "solving the case".