Is someone targeting the brains of US officials with a covert weapon?
A CIA agent hears a strange sound in Havana - and his life begins to fall apart.
A flag raised, a thaw begins - then a CIA agent arrives, and things take a dark turn.
As cases grow, an agent pushes for answers, and someone new gets far closer than expected.
A media and political storm gathers around detectives investigating in Havana.
Havana Syndrome becomes entwined with an old bloody fight against Castro.
Havana Syndrome spreads. And an eerily similar phenomenon in '70s Moscow is investigated.
Havana Syndrome patients are back in the dark, Cuba is on the brink.
Sam Bungey shares a quick update on the next few episodes.