At the heart of this many-centred novel is Deepali Sarkar, a young Hindu attracted to the extreme left wing of the nationalist movement, and Rehan Ahmed, a Muslim radical of Marxist inclinations who introduces her to the life of the rural deprived. Their common political engagement draws them into a quietly doomed love affair. Through their relationship, Hyder explores the growth of tension between Bengal’s Hindus and Muslims who had once shared a culture and a history.

“History,” says Hyder, “is another name for humanity’s inability to learn its lesson.” Lit by the flare of Hyder’s prose, history is captured in the glow of the firefly’s wing, unfolding in the lives of her characters as they try to come to terms with their own and Bengal's shifting fortunes.