The disappearance of a father-of -four from Comber, Northern Ireland. Police suspected he'd come to harm, but struggled to find proof without a body. Six weeks later, they discovered his body stuffed in a wheelie bin and dumped in a lake. They soon had two prime suspects, but detectives needed to find a way to place them and the victim at the same place at the same time, so obtained the services of a cell site analyst to track the suspects' movements. Plus, how a soil expert unearthed the truth when a 63-year-old grandfather disappeared in the Highlands