Every president has had a unique and complicated relationship with the intelligence community. While some have been coolly distant, even adversarial, others have found their intelligence agencies to be among the most valuable instruments of policy and power. Since John F. Kennedy's presidency, this relationship has been distilled into a personalized daily report: a short summary of what the intelligence apparatus considers the most crucial information for the president to know that day about global threats and opportunities. This topÌÎÌãÌ´åsecret document is known as the Presidents Daily Brief, or, within national security circles, simply the Book. Presidents have spent anywhere from a few moments (Richard Nixon) to a healthy part of their day (George W. Bush) consumed by its contents; some (Bill Clinton and George H. W. Bush) consider it far and away the most important document they saw on a regular basis while commander in chief. The details of most PDBs are highly classified, and will remain so for many years. But the process by which the intelligence community develops and presents the Book is a fascinating look into the operation of power at the highest levels.