A definite article

It's the fastest selling autobiography of all time. It's A Journey, by Tony Blair. Formerly titled The Journey, but, after what publishers Random House (my publishers!) described as "a minor editorial decision", this was stripped of some of its portent and pomposity with a clever switch from "The" to "A". But they're fooling no one: if this book was just a journey, it wouldn't have sold so many copies in the first 24 hours of publication, outselling Peter Mandelson's memoir three to one, and ...