The first instalment of the two-part drama, starring Kelly Reilly as a young detective investigating a series of gruesome killings of drug-using prostitutes, attracted a 27.6% share of the 9pm-10.30pm audience to win the primetime slot.
BBC One's 'Swarm: Nature's Incredible Invasions' documentary came in second in the ratings battle with 5m viewers and a 19.2% share of the 9pm-10pm audience.
The two-part documentary explores all sorts of swarms to see how these forces of nature affect our lives and includes footage of hundreds of bees invading a Costa Rican football pitch and trillions of lake fly midges choking an African village.
The third instalment of 'Celebrity Big Brother' attracted 3.3m viewers and a 12.6% share of the 9pm-10pm audience as viewers tuned in to see TV host Terry Christian name 'Shooting Stars' captain Ulrika Jonsson as the celebrity with the biggest ego. Channel 4+1 added an extra 394,000 viewers.
BBC Two's 'The Antiques Rogue Show' documentary about a couple in their eighties from Bolton who conned the experts with more than 100 faked artworks that their son had created in the garden shed drew 2.2m viewers and an 8.6% share of the 9pm-10pm audience.
Five's airing of Arnold Schwarzenegger film 'Eraser' netted 1.2m viewers and a 5.6% share of the 9pm-11pm audience.
Earlier in the evening the first episode in a new series of BBC One's 'Lark Rise to Candleford', starring Julia Sawalha and Jason Merrells, attracted 6.3m viewers and a 23.7% share of the 8pm-9pm audience.
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