Narrated by Nicola Walker and a full cast. An Audible Original presented as a radio play. In the near future a crew of scientists launch from Earth on a Mars mission. By the time they get there, all humans on Earth have simply vanished. Against all odds they survive, start a colony and thrive for a thousand years. But when resources are running out and the Mars colony is threatened with extinction, they decide to send two time-travelling teams to Earth for find out a) why humans vanished and b) whether the Martian humans can re-colonise the homeworld. This story flips between the stories of the two teams, which eventually come together. Expect some timey-wimey-wibbly-wobbly stuff. Quite engaging, though, to be honest, I’d rather have a straight narration rather than a full-cast audio play.