First of a two-part profile of the philosopher and peace campaigner who influenced the thinking and attitudes of millions. He preached tolerance and liberal values, but, as friends and family remember, the logic and reason of his public life were in sharp contrast to a private world of passion, jealousy and marital disaster. This film explores Russell's extraordinary career, from his battle to masterthe logic of mathematics to his forays into politics and journalism, as a quest for intellectual certainty was matched by a private life riddled with instability.