Using unpublished diaries, Jim Perrin, the acclaimed author of The Villain and Menlove, tells the story of the greatest exploring partnership in British history.

Jim Perrin is one of Britain's most highly regarded travel writers and was one of the best British rock-climbers - with many new routes, significant solo ascents and free ascents at the top standards of the day. He is a regular contributor to the Guardian, the Daily Telegraph, Climber, The Great Outdoors and broadcasts regularly on radio. His biography, Menlove, was the first outright winner of the Boardman Tasker Prize, for which all of his subsequent books have been shortlisted. His previous book, The Villain, was joint winner of the Boardman Tasker Prize and winner of the Mountain History Prize at the Banff festival.