Burning crosses light the night sky, fireworks are exploding, flaming tar barrels are being dragged through the streets. A huge unruly crowd – men, women and children dressed in costumes as Red Indian chiefs, circus masters, Arab sheiks, jesters, harlequins, and hundreds of people with their faces blacked like Zulu warriors – are singing and chanting, part of a vast torchlit procession. It is Bonfire Night in Lewes, Sussex, November 1937.

Join Morley, Miriam and Sefton on the morning after the night before, when they discover the body of a woman who appears to have drowned in the freshwater lido in the centre of Lewes. Was it an accident or could it be … murder?