Toby Stephens

A millionaire businessman is found dead one year after he disappeared - he has been kept prisoner in an underground cellar but the kidnapper made no ransom demands. The victim appears to have committed suicide with pills. In the same cellar another male body is found - this one appears to have been brutally murdered and some years earlier, presumably by the same man. Retracing the steps of the two men leads the team to an unlikely suspect.

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 and shortly afterwards, so does his wife. The team realise that the murders took place in order to prevent the truth of the killer's secret life from reaching his wife. In a bid to prevent her being hurt by the revelations, she is going to be his next victim.