Detective Conan

Monday, 7:30 PM Murder Case (2x8)

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A murder was committed at 7:30 pm on Monday. The discoverer of the body was Ayumi's dentist, who was checking Ayumi's teeth at the time of the killing.Further inspection showed that the dentist had a good reason to kill the victim. But she had an alibi, so the police turned away their suspicion of her. Conan thought that there was a trick. What was it?