When a bedraggled woman turns up on Rory Cavenham’s doorstep in the middle of a storm, convinced that the year is 1972, he’s torn. Recent troubling experiences have left him scarred and wary of involvement, yet he can’t help feeling touched by her strange plight. But she claims she’s lost her memory, so she can’t explain her situation.

Before he knows it, she’s slipped into his life; but she’s frightened of unspecified pursuers, so he has to keep her presence under the radar. He’s drawn to her, but starts to wonder whether he’s exploiting her or she’s exploiting him.

Eventually they identify two women who fit her description – one in the present day, the other in the past. But where do their lives intersect, and how could she be both of them at once, even if such a thing were possible? Their quest becomes more urgent when the imagined pursuers turn out to be all too real.