Investigations correspondent Sirin Kale reports on the allegations of violence and sexual assault against author Christopher Berry-Dee

Christopher Berry-Dee has been a pioneer of the true crime genre for years. The UK’s all-time bestselling true crime author is a self-proclaimed expert in serial killers, persuading them to give interviews and laying out their crimes in extensive detail.

‘Persuasive,’ says Sirin Kale after speaking to many who know him, ‘that’s a word that comes up a lot.’