Nearly 14 years ago the national media was gripped with the tale of The Doorstep Murder.
Alistair Wilson, a Scottish banker who lived a seemingly normal life, was gunned down outside his home in a sleepy seaside town.
The case has never been solved.
Peter Bleksley - a former police detective who you might recognise from Channel 4's Hunted, has written a book on the case called To Catch A Killer.
To Catch a Killer is out on Thursday.