Ten years ago, Frances Stonor Saunders was handed an old suitcase filled with her father’s papers. Her father’s life had been a study in borders – exiled from Romania during the war, to Turkey then Egypt and eventually Britain, and ultimately to the borderless territory of Alzheimer’s. The unopened suitcase seems to represent everything that had made her father unknowable to her in life.

So begins a captivating exploration of history, memory and geography, as Frances Stoner Saunders decides to unpick her family’s past.