Simon Singh and John Lynch's film tells the enthralling and emotional story of Andrew Wiles.
A quiet English mathematician, he was drawn into maths by Fermat's puzzle, but at Cambridge in the '70s, FLT was considered a joke, so he set it aside.
Then, in 1986, an extraordinary idea linked this irritating problem with one of the most profound ideas of modern mathematics: the Taniyama-Shimura Conjecture, named after a young Japanese mathematician who tragically committed suicide.
The link meant that if Taniyama was true then so must be FLT.