On July 11, 1995 the Bosnian Serbs captured the enclave Srebrenica. Thousands were executed. Claims were made that Western intelligence agencies had spectacular foreknowledge about the attack. But was this true? Or was it an intelligence failure? This book examines these questions presenting in as much detail as possible the intelligence collected by the Western services in Bosnia. The author was granted full access to the top-secret archives of the Dutch services and the still classified UN archives. Foreign intelligence services gave him confidential briefings. The author spoke with more than 100 intelligence officials from various countries.