People in Line

There was a long queue at the Woffington Theater in London. A man who was queuing up to buy tickets to watch a musical was found dead in the queue with a bright silver and evil dagger stuck in his back! What's strange is that the people in front of the deceased don't even know when the deceased was killed? There was nothing on the deceased that could identify him. "Elegant Detective" Grant personally took action to investigate the case, and the suspects were easily captured. When he was done, the detective's sixth sense gave him new confusion about the case...