Faber has signed up the memoirs of the former Mayor of London Ken Livingstone, for an unconfirmed £90,000.
Editorial director Neil Belton acquired world rights through Jonathan Lloyd at Curtis Brown, and plans to publish in November 2012.
Belton said: "I'm very pleased that Faber will be publishing the memoirs of Britain's most successful and controversial radical politician. This is not standard Westminster fare, turgid and cautious: it's full of Livingstone's salty wit, passionate advocacy, undiplomatic judgements of time-servers and fascinating human detail.
"He has taken risks and done big things, and even his worst enemies will find the book interesting".
Livingstone has written two previous books, both published by HarperCollins, If Voting Changed Anything They'd Abolish It (1987) and Livingstone's Labour (1989). He said this volume will be "heavily dominated by London politics" but will try to explain "why politicians are predominantly seen as failures". He added it was also a "social history of the post-war period".
He was born in south London in 1945, and began his political career serving on Lambeth and Camden Councils. He was Labour MP for Brent East from 1987 to 2001. He was the first elected Mayor of London between 2000 and 2008, and will be running for the post again next year.