The Bridge, 9pm, BBC2

EPISODE FOUR of eight finds Saga and Henrik questioning Morgan Sonning, whose car has been linked to Margrethe Thormod’s death. Sonning insists that the car was in the garage at the time — but is he telling the truth? Meanwhile, Saga (Sofia Helin, pictured) makes Henrik an offer, and a horribly ingenious third murder takes place at the hospital in Malmo, giving the case a new dimension.