Alan Yentob spends time with Philip Pullman in Oxford, discovering how the ex-teacher became an acclaimed author of fantasy fiction and an outspoken critic of organised religion.

Romantic, fearless, fantastical; this edition delves into the thrilling world of Philip Pullman and explores the author's own dark materials.

Pullman has been named both one of Britain's greatest writers and the most dangerous writer in Britain. He is best-known for the much-loved His Dark Materials trilogy, which follows a young heroine, Lyra, through a series of heart-stopping adventures into other worlds. Appealing to both adults and children alike, his books have sold over 20 million copies and have been translated into 40 languages. La Belle Sauvage, his recent novel, became an instant best-seller. 'The things we need most in the world are stories,' he says.

Alan Yentob spends time with Pullman in Oxford, discovering how the inspirational middle-school teacher became an acclaimed author of fantasy fiction and an outspoken critic of organised religion.