Terrestrial history : a novel

Hannah is a fusion scientist working alone at a remote cottage off the coast of Scotland when she sees a figure making his way from the sea. It is a visitor from the future, a young man from a human settlement on Mars, traveling backwards through time to try to make a crucial intervention in the fate of our dying planet, and he needs Hannah's help. Laboring in the warmth of a Scottish summer, Hannah and the stranger are on the path towards a brea...