On a January morning in 1913, G. H. Hardy - eccentric, charismatic, and, at thirty-seven, already considered the greatest British mathematician of his age - receives in the mail a mysterious envelope covered with Indian Stamps. Inside he finds a rambling letter from a self-professed mathematical genius who claims to be on the brink of solving the most important unsolved mathematical problem of all time. Some of his Cambridge colleagues dismiss the letter as a hoax, but Hardy is convinced that the Indian clerk who wrote it deserves to be taken seriously.

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