The Mysterious Case of the Gentleman of Heligoland Ken Davies / Iain Mackay

We've found ourselves focussing on a series of horrific crimes perpetrated in Belgium. A crime spree that involved a very tall man - A man known as The Giant by the Belgian police. We needed to know more about this man to see if there was any potential link to the Gentleman. There was one person who we could turn to; A journalist who has been covering that case for over 20 years - and it's a fascinating story.

We are on the lookout for Giants, and we've found a 6'5" man who is acquitted of murder, with striking similarities to the Gentleman, but that all depends on what happens to him afterwards? And is he the only giant we need to be taking a much closer look at?

We need to catch up on the victims of the Barbel, we take a new approach to looking for potential people who may be the Gentleman with positive results, and the investigation takes a European turn.

We're back on the case - We learn more about isotopes and Iain makes a very intriguing discovery.

We have two men in our sights as our search for the Gentleman of Heligoland continues. David Martin, the Australian millionaire who went missing in 1992 and David Krueger, the 6'5" German man missing from Canada - But how can we rule them in or out?

Things are moving quickly in the investigation. New clues, new science and we're on the trail of two new potential victims