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.

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

Havana Helmet Club is a Yarn production for Radio 4 and BBC Sounds