Behind-the-scenes means happening out of the public's sight. A behind-the-scenes deal.
The image is a theatre, where the interesting work is all off stage. A behind-the-scenes account is popular precisely because the public was not meant to have it.
1adjectivebehind-the-scenesHappening out of the public's sight.
“The behind-the-scenes negotiation lasted longer than the summit.”
behind-the-scenes is a quality.