Waking the Dead - Series 5 - Subterraneans - Part 1

Police drama series based around cold cases. A millionaire businessman is found dead one year after he disappeared - he had 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 some years earlier, presumably by the kidnapper. Retracing the steps of the two men leads the team to an unlikely suspect.