Ash is a failed actress who is done trying to 'make' something of her life. Until a golden opportunity drops in her lap: a job at Retro, an agency who organise trips into the past for the ultra-wealthy.

Energised by her new role, Ash throws herself into leading bachelorette parties in the Old West, birthday parties at Woodstock and a situationship with a hard-drinking detective from 1937. But as time goes on, it becomes clear that Retro's shadowy founder Ro has terrifying designs for the company's future - and for the part Ash herself can play in it.