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　　The story of how police repeatedly allowed a serial murderer to slip through their fingers.　　Stephen Port date-raped and murdered four young gay men in East London within fifteen months and dumped all four bodies within a few hundred metres of each other.　　Yet Barking and Dagenham police failed to link the deaths, until weeks after the fourth one. The film tells the story through eyes of the families of Port's victims, unpicking how the police failed to properly investigate each of the dea