Detective Conan: The Assassin in the Pupil

Conan witnessed a policeman being shot and killed in the rain while making a phone call on the street. He hurriedly tracked the murderer, but the murderer escaped. The deceased closed his eyes for a moment and clutched his left chest, which seemed to indicate something. Afterwards, Conan learned from Officer Megure that clutching the left chest was a hint that there was a police manual there. Soon another policeman was shot to death in an underground garage while holding a police manual. Regarding these two cases, Officer Megure and others were uncharacteristically unwilling to reveal too much information to Kogoro Mori and Conan. Maori was unwilling to ask further questions, and Officer Shiratori only replied, "Need not to know." This is a secret code used among police officers, which means that the two killings are related to police insiders. Conan, Xiaolan and others attended Sister Shiratori's wedding banquet. The electricity suddenly stopped. At that moment, Xiaolan was in the bathroom with policewoman Sato. When Xiaolan picked up the flashlight next to her to illuminate, a bullet shot into Sato's body, and Xiaolan fainted from fright. Xiaolan woke up the next day, but she lost her memory because she blamed herself for causing Sato to be shot. Seeing that the situation was getting more and more serious, Megure revealed the secret. It turned out that the two policemen who died were working with Sato to re-investigate a case about the suicide of doctor Hitano, which involved the son of the police chief. Assuming the director's son as a suspect...