Eve McNabb receives many consolation letters after the death of her mother, May. One missive, though, is disturbingly different from the rest. Addressed to May and signed Jean, this letter suggests there was once a physical intimacy between Jean and May and makes a veiled reference to the business with John, Eve's late father. Determined to locate the unknown sender, Eve turns to Omkar Rani, an Indian policeman who's also a philatelist, for help in deciphering the envelope's smudged postmark.