This week we're going all the way back to the blood-soaked streets of the Roman Empire to tell the tale of lamentable lady Locusta - the world's first serial killer - and her employer Agrippina The Younger. Learn how they used feathers, mushrooms and hot wine to bring one of history's most notorious emperors to power, and prepare to be horrified and puzzled at how Locusta eventually met her end...

This week's secret ingredient is....a feather!