In 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.

At 6pm on 31 January 2017, three days after Chinese New Year, 64-year-old Hang Yin Leung hears a knock at the door. She's alone at home and not expecting any visitors. Her husband works seven days a week at the takeaway business they've built together. She answers the door and, within seconds, the lives of this hard-working family are changed forever. A violent attack by six men leaves the house ransacked. They are heard laughing as they run off down the road with bags of stolen goods and the family savings. But the worst is yet to come: as Hang Yin reveals to police the true nature of the attack, she falls ill and is rushed to hospital. She never recovers. Her death launches a huge cross-border manhunt and one of 'the most difficult homicides' the detectives have ever investigated.