A documentary into the disappearance of a Wisbech man who was missing only to be found five years later living in a wood in Cambridgeshire will be aired tonight.
Lithuanian born Ricardas Puisys vanished without trace from his home in September 2015.
Investigations lead detectives from the Major Crime Unit to discover Ricardas, who was 35 at the time he went missing, may have been the victim of a serious assault in the hours before his disappearance.
The main line of enquiry was that he had been murdered.
That was until the five year case took an unexpected turn and the team were given some hope he may be alive.
Officers discovered a Facebook page had been set up by someone claiming to be Ricardas.
The team identified the owner of the account and finally found Ricardas living in undergrowth in a Cambridgeshire wood.
Police said he was well concealed after having deliberately hidden and having not spoken with anyone for some time.
During the case police say they uncovered disturbing details about the world of modern slavery in Cambridgeshire.
'The no body murder' case will feature on '24 Hours in Police Custody' on April 5.