In the near future, a civil servant is offered the salary of her dreams and is, shortly afterward, told what project she'll be working on. A recently established government ministry is gathering "expats" from across history to establish whether time travel is feasible--for the body, but also for the fabric of space-time. She is tasked with working as a "bridge": living with, assisting, and monitoring the expat known as "1847" or Commander Graham Gore. As far as history is concerned, Commander Gore died on Sir John Franklin's doomed 1845 expedition to the Arctic, so he's a little disoriented to be living with an unmarried woman who regularly shows her calves, surrounded by outlandish concepts such as "washing machines," "Spotify," and "the collapse of the British Empire."