Des viewers were left utterly terrified tonight over grisly scenes involving boiled heads, rotten torsos hidden in cupboards and even comments about necrophilia.
But more than that, viewers were chilled to the bone by David Tennant's eerie portrayal of serial killer Dennis Nilsen. The new dark three-part ITV drama follows the 1983 arrest of the Scottish serial killer who murdered at least 12 young men and boys in London.
Tonight's episode saw human remains discovered by a plumber, who had been responding to complaints made by tenants of Cranley Gardens.
After opening up a drain covet at the side of the house, small bones were and a flesh-like substance were discovered, prompting the drainage and plumbing company workers to contact the
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