A series of murders targeting police officers has occurred, causing a massive uproar within the police force. Inspector Megure unexpectedly remains tight-lipped when Kogoro tries to obtain information about the case. Seeing this, Conan deduces that the matter may be deeply connected to the police department. Then, the next target of the shooting turns out to be Detective Sato! Ran, who happened to be at the crime scene, is traumatized by the incident and loses her memory! The culprit, aiming to silence all witnesses, attempts to kill the only one left! Fully aware of the severity of the situation, Conan risks his life alone to track down the perpetrator in order to protect Ran!