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Big Brother 27, titled "A Summer of Mystery," premieres July 10th on CBS. The 90-minute premiere introduces 16 houseguests, plus a mystery 17th contestant residing in "Hotel Mystère." The 16 revealed contestants represent a diverse range of ages, backgrounds, and professions, promising an exciting season. Viewers will have to tune in to uncover the identity of the secret houseguest.

Prepared by Emily Rhodes and reviewed by editorial team.