1950s Kenya. The Mau Mau uprising. A disparate group of women lie low in a remote house in the jungle, waiting for a resolution or for rescue. Among these British imperialists is Elizabeth Klein, a refugee from a timeline that no longer exists - thanks to the Doctor.

Reunited, the Doctor and Klein are forced to set aside their differences by terrifying circumstances. People are dying in this remote place. One by one. And there's something out there, in the jungle, accompanied only by the flutter of a thousand tiny wings...