Please answer the following question: Generate a question that has the following answer: None for the following movie plot: Sidney Bruhl (Caine) is a playwright who is most famous for his mystery thriller "The Murder Game." Following the debut of the latest of a series of flops, he returns to his home in East Hampton and to his wife Myra (Cannon). He tells her that he's received a play called "Deathtrap" from a former student from a playwriting seminar. The play is ready for production and Sidney jokingly suggests that he murder the student and steal the play, a joke that becomes more serious when he learns, after calling the student, that no one else has read the play and no one else has a copy. Sidney invites the student up to Long Island. The student, Clifford Anderson (Reeve), arrives shortly thereafter. Myra, who has a heart condition, becomes more and more agitated as the evening progresses, trying desperately to convince Sidney to work with Clifford on "Deathtrap" and share the revenue. Instead, Sidney attacks Clifford, strangling him with a chain. He forces Myra to help him drag Clifford into the yard to bury him. Following the burial, the Bruhls get a visit from psychic Helga ten Dorp (Worth), who's staying with the Bruhls' neighbors. Helga wanders around the living room and study, sensing pain and death in various spots and associated with various prop weapons and handcuffs Sidney has displayed on the wall. She warns Sidney about a man in boots who will attack him. As she prepares for bed, Myra continues to be horrified, only slowly coming to see something of glamour in Sidney's act. Suddenly, Clifford bursts through the bedroom window and beats Sidney with a log. Myra flees and Clifford chases after her until her heart gives out; she collapses and dies. Sidney calmly descends the stairs, uninjured, and sidles unperturbed to Clifford's side. The men exchange a few words before their feelings emerge. They kiss, deeply and passionately. Their plan is a success: Myra is out of the way. Immediately after Myra's funeral, Clifford moves in as Sidney's "secretary." Clifford works on a play which he says is about a welfare...
A:
How many seats were empty at the play?