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n the centre of historic Oxford a man lies dead in his doorway. There are no suspects, no witnesses and no sign of forced entry. Adrian Greenwood, a 42-year-old antiquarian book dealer, is dead, stabbed over 30 times in his own home in a frenzied and brutal attack. Greenwood had built up a reputation throughout his short life as an exceptionally talented book dealer. He had bought and sold early editions of Harry Potter and came to media attention following the sale of a rare piece by Banksy in 2011. The pressure is on Detective Superintendent Kevin Brown and his team to discover who killed Greenwood. And what has happened to his £50,000 early edition of The Wind in the Willows? With unprecedented access to Thames Valley Police Major Crime Unit, this episode of Catching a Killer - The Wind in the Willows Murder - follows all the twists and turns of this real-life crime.