Eilidh, bright, headstrong and feisty, gets sparkling exam results that confirm her university place. Her boyfriend reveals he has deceived her. In the ensuing argument she is knocked unconscious. She arrives in 1984, in an Ethiopian refugee camp, where she nurses a dying child, then a wounded aid worker before wakening back home in present-day Scotland. Three days later, at an isolated beauty spot trying to come to terms with her ex boyfriend's betrayal and her experience in Ethiopia, she encounters Walter, who is in the early stages of dementia. He is there because of a tattoo on his wrist that simply states the date and location of the beauty spot. Eilidh recognizes Walter's symptoms, takes him home and contacts his niece to come and collect him.

Over the following 48-hour period Eilidh finds herself transported to various locations in Europe and North America, and time periods from the previous fifty years. Each episode draws her further into an unexpected and unconventional romance. Eventually she travels to WW2 blitzed Liverpool and meets a fellow time-traveler who explains that Eilidh faces a decision with life and death consequences.