Waking the Dead - Series 5 - Subterraneans - Part 2

Police drama series based around cold cases. The team know they have their man, now all they have to do is prove it. As they collect the damning evidence their suspect disappears, as does his wife shortly afterwards. The team realise that the murders took place to prevent the truth of the killer's secret life from reaching his wife, and know that in a bid to prevent her being hurt by the revelations the killer is going to kill her too.