Since 1985, thousands of young, fit Thai migrant labourers have poured into Singapore to work on the construction sites. Three hundred have died as a result of a strange electrical disturbance of their hearts called fibrillation. Every year, sudden death kills over 100,000 Britons. In the US, the figure is a quarter of a million. Whilst many of the victims in the West have some history of coronary heart disease it is not the classic heart attack that kills but a rapid onset of the same fatal electrical activity. The programme follows a bizarre trail to pick up clues to the nture of sudden death. It involves the sudden demise of super-fit athletes; voodoo deaths; cot deaths; the Long Q-T Syndrome, where young children can drop dead at the shock of an alarm-clock going off; the mystery deaths in South-East Asia of Thai labourers, and Hill-Tribe refugees living in Thai transit camps.