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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 ´óÏó´«Ã½ Sounds. Subscribe now so you never miss an episode. Email us at lauraandiain@bbc.co.uk and join the conversation using the hashtag #lauraiainpodcast.