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A human torso dumped at a Salford beauty spot sparks a murder investigation. Police trawl CCTV looking for a suspect carrying something heavy and, as more body parts are discovered, the cops close in.

A series of seemingly unrelated events reveals a web of organised crime. How did an iPad found in the River Thames link a UK murder plot with a heist from a Swiss museum?

The drug-assisted crimes of "one of the most prolific sexual predators" UK police have seen are revealed through found footage. How did secret recordings expose the double life of rapist, Zhenhao Zou?