Description taken from PC version of this game

Nearly 70 years have passed since the incidents of The 7th Guest. All had been well until Robin Morales, a television reporter, disappared after being assigned to investigate the old Stauf Mansion. Meanwhile, Carl Denning, our faithful hero and Robin's boyfriend, has just received a Game Book in the mail directing him to come to the Stauf Mansion. You assume the role of Carl, and head out to the place where evil resides. With your trusty Game Book in hand, you set out to solve an all-new set of Stauf puzzles in The 11th Hour, find Robin, and send Stauf back to the foul hole from whence he came. ~ Michael L. House, All Game Guide