When a letter from an Indian historian arrives out of the blue and informs leading academic Bart Moore-Gilbert that his beloved deceased father, a member of the Indian Police before Independence, took part in the abuse of civilians, his world is shaken as cherished childhood memories are challenged. He sets out in search of the truth-discovering much about the end of empire, the state of India today, and whether his father, as one of the many characters on his quest claims, really was a terrorist.

Crisscrossing western India, and following leads from bustling Mumbai to remote rural locations, Moore-Gilbert pieces together the truth, discovering that the story of his father's life links today's politics with the past's, colonial India with its modern incarnation, terrorism across the ages, and father with son. The Setting Sun is at once an extraordinary meditative voyage across India, a story of the dying days of an empire, and a gripping family history.