Scrabble is experiencing a renaissance. The younger generation have rediscovered the game online - through the copyright busting Scrabulous - and they're having night after night on the tiles. Alan Yentob sets out to discover why the word game leaves us spellbound, tracing its surprising history, meeting the American tournament Word Freaks, and paying a visit to the SAS-style training camp that the Nigerian government trains their players at.

• Documentary