Presenter James Blake finds there is a policing war raging online. Plus: a cold case gets a breakthrough. Here’s what to watch this evening

10.40pm, BBC One

After the identity of the social media influencer James Blake was stolen and used in scams, he made a documentary about it – last year’s Hunting the Catfish Crime Gang. So he is well placed to tackle another investigation, this time into how cyber sex crime has become an online policing war. But as he speaks to young people and experts, and travels across the globe in pursuit of answers, he is shocked to find that the “sextortion” picture is even darker than he imagined. Hollie Richardson

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