At a time of hyper-partisanship, media fragmentation and "fake news", the work of investigative journalism has never been more important. This book explores the history and art of investigative journalism, and explains how to deal with legal bullies, crooked politicians, media bosses, big business and intelligence agencies; how to withstand conspiracy theories; and how to work collaboratively across borders in the new age of data journalism. It also provides a fascinating first-hand account of the work that went into breaking major news stories including WikiLeaks and the Edward Snowden affair. Drawing on over 40 years of experience with world-leading investigative teams at newspapers including the Guardian and The Washington Post, award-winning journalist David Leigh provides an illuminating insight into some of the biggest news events of the 20th and 21st centuries. This book is essential reading for anyone interested in the behind-the-scenes work of journalists and news organizations. It also acts as an essential practical toolkit for both aspiring and established investigative journalists.