<p>When the room begins spinning wildly, CIA agent Marc believes he has been hit on an assignment in Moscow. It turns out, an eerily similar phenomena in the Russian capital - affecting US embassy staff – happened before, in the 1970s… Meanwhile, Adam - back on US soil - begins to suspect he is being followed. And the search is on for an untraceable weapon.</p><p>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: Peregrine Andrews 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 </p><p>Havana Helmet Club is a Yarn production for Radio 4 and BBC Sounds</p>