Officer Sato was greatly relieved to hear them. "Then we only need to search the other half of the train—this cuts down the workload considerably. You've been a huge help."
Mouri Ran smiled shyly, while Suzuki Sonoko lifted her chin. "No need to be so polite. It's only natural!" Detectives and police were practically family, so naturally a Beautiful Girl Detective's assistant was too!
Officer Sato organized the personnel and prepared to search the remaining half of the train for anywhere the murderer might be hiding.
Jiang Xia stood patiently to one side, thoughtfully giving his colleague some time to hide the gun.
Before long, the Mist Tengu flew back and muttered something to Jiang Xia.
Jiang Xia acknowledged it, then turned to Officer Sato. "Come to think of it, the Shinkansen passed through more than one Tunnel along the way. If a passenger had happened to be using that restroom, the plan couldn't have worked.
"So I think that before Chizo Ogura went to the restroom, the murderer must have surveyed the situation beforehand. Only after confirming that the restroom was empty and the plan could be carried out did he send Chizo Ogura some sort of signal, hinting that the plan had begun."
Sato Miwako nodded as she listened, then asked Officer Takagi, "Takagi, did you notice anything unusual after I left? At the time, you were sitting with Chizo Ogura. If he could see the signal, there's a good chance you could too."
"Um..." Officer Takagi tapped his head and racked his brains. "Other than Chizo Ogura insisting on going to the restroom, I don't think there was anything unusual."
As he spoke, he caught sight of Conan beside him, looking as if he wanted to say something. A flash of inspiration struck him, and he slapped