This week Iain looks at the case of Caroline Grills, an elderly lady with a killer instinct when it comes to making tea. It’s 1947 in Sydney, Australia, when members of Caroline’s family begin to fall ill with a sudden and mysterious ailment. No one can understand what’s going on – until Caroline’s nephew reads a newspaper article that blows the case wide open.

Murder They Wrote with Laura Whitmore and Iain Stirling is available weekly on BBC Sounds. Subscribe now so you never miss an episode. Email us at lauraandiain@bbc.co.uk and join the conversation using the hashtag #lauraiainpodcast.