A Pakistani vendor sells traditional sweets close to the perimeter of the walled compound where al-Qaida leader Osama bin Laden was killed in Abbottabad, Pakistan.

It seemed an innocuous, catch-up phone call. Last year Abu Ahmed al-Kuwaiti, the pseudonym for a Pakistani known to U.S. intelligence as the main courier for Osama bin Laden, took a call from an old friend.
Where have you been? inquired the friend. We