Directed by BAFTA-winning filmmaker Jezza Neumann (Children of Gaza), this latest in a strand of one-off documentaries goes behind the scenes at Thames Valley Police’s Major Crime Unit as they investigate a shocking murder in Oxford.

Adrian Greenwood, a 42-year-old antiquarian book dealer, was found dead at his home last year, stabbed more than 30 times – and his early edition of The Wind in the Willows, worth £50,000, was missing.

The documentary follows all the grim twists and turns of the devastating case.