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“A tense environment and a good villain” are the perfect ingredients for mass hysteria, according to psychologist and epidemiologist Professor Simon Wessley. It’s a phrase so toxic, it was removed from the diagnostic manual in the late 1960s. But as neurologist and mystery illness expert Suzanne O’Sullivan explains, “We are all vulnerable. We just need to meet the right circumstance.” In the penultimate episode of Havana Helmet Club, Jennifer Forde and Sam Bungey investigate high-profile cases of mass hysteria – now known as mass psychogenic illness or conversion disorder - for clues about Havana Syndrome. Could it be the solution to the puzzle, or a way for the CIA to dig themselves out of a hole? Credits Havana Helmet Club is written and presented by Jennifer Forde and Sam Bungey Editor: Guy Crossman Story editing: Mike Ollove Producer: Larry Ryan Sound designer: Merijn Royaards Additional mixing: Ger McDonnell Theme music: Tom Pintens, with additional music composed by Merijn Royaards Fact checking: Stanley Masters. Additional reporting: Isobel Sutton, Pascale Hardey Stewart and Stanley Masters Archive producers: Miriam Walsh and Helen Carr Production executive: Kirstin Drybrugh Editorial advisor: Jesse Baker Commissioner: Dylan Haskins Assistant commissioners: Sarah Green and Natasha Johansson Havana Helmet Club is a Yarn production for Radio 4 and �鶹�� Sounds.