The buried giant / Kazuo Ishiguro.

Enhanced descriptions from Syndetics:

From the author of Never Let Me Go and the Booker Prize-winning The Remains of the Day

The Romans have long since departed and Britain is steadily declining into ruin. But, at least, the wars that once ravaged the country have ceased. Axl and Beatrice, a couple of elderly Britons, decide that now is the time, finally, for them to set off across this troubled land of mist and rain to find the son they have not seen for years, the son they can scarcely remember. They know they will face many hazards--some strange and otherworldly--but they cannot foresee how their journey will reveal to them the dark and forgotten corners of their love for each other. Nor can they foresee that they will be joined on their journey by a Saxon warrior, his orphan charge, and a knight--each of them, like Axl and Beatrice, lost in some way to his own past, but drawn inexorably toward the comfort, and the burden, of the fullness of a life's memories.

Sometimes savage, sometimes mysterious, always intensely moving, Kazuo Ishiguro's first novel in a decade tells a luminous story about the act of forgetting and the power of memory, a resonant tale of love, vengeance, and war.