A panel show where contestants have a hidden secret (hence the title) which is usually a stunt or occupation.
QTQ - 1967-1973
A panel of four celebrity guests faced one contestant or a group of contestants. Each contestant that appeared had a weird, fabulous, laughable and/or unusual secret. When the game started after the contestant came out & introduced himself/herself, the contestant whispered the secret into the host's ear, and the home audience was shown the secret. After that, the host would give a clue to the panel concerning the secret; that's when the questioning began. Each panelist one at a time in turn asked yes or no questions to the contestant in an attempt to guess the secret. The panelist in control would have an unmentioned amount of time to question the contestant. When the time was called by the producers and the panelist in control did not guess the secret, the next panelist in line would do the questioning. The process went on until either the secret was guessed, or until the entire panel questioned the contestant. After the game, the contestant would talk about his/her secret via the host's interview and sometimes a video/movie clip or demonstration would be shown.