大象传媒

West Midlands Police are called by a distressed young Chinese woman who speaks very little English but has clearly just witnessed a horrific attack by an intruder who has fled the scene.

On arrival at the property, the police find a Chinese national who has been subjected to multiple stabbings, and despite some signs of resistance, died at the hands of a merciless killer. They quickly deduce that the scene is a brothel and that the caller who witnessed the attack may be linked to trafficking by a criminal gang, which places her at increased risk.

But there is no sign of a murder weapon, and as the body is removed for post-mortem analysis, the pressure is on. The forensics team move fast in order to capture any potential DNA evidence before any samples degrade during the night - both inside the brothel and outside, where they discover a trail of blood leading away from the scene.