The Prime Minister met some of the world's most influential and powerful people, but we will not be told who he spoke to, nor what they discussed.
David Cameron was attending the annual meeting of the secretive Bilderberg club. The group insists on total privacy so members can talk candidly about global issues.
But, as Political Correspondent Carl Dinnen reports, there's growing anger at its lack of openness:
More top news
More than 120 famed actors and music stars said they are using their "privilege to speak out" to warn of Trump's "real and present threats".
A character is seen carrying a tray of hot drinks before slipping on some paper, with one sheet appearing to be covered with Arabic script.
A historic night in Philadelphia saw mixed emotions as a bitter rivalry was settled before Bill Clinton made his pitch for his wife to lead.