Red Nile: a biography of the world's greatest river.

"....the book is very Egypt-centric. But if you have read Twigger before, you will know to expect divergence, wit, a weakness with the esoteric, and an ability to make even the most obscure details seem relevant. All of which is perfectly suited to this subject and makes for an entertaining and absorbing read." Anthony Sattin The Observer, Sunday 16 June 2013