Mori is in the hospital after injuring his ankle. While there, he witnesses a shadow of a murder. After causing an uproar three times and finding the place where the murder took place was an empty room, the murder occurs on the fourth time. Conan figures out that light is being reflected to that room and that the the first three times were in a different room while the fourth one occurred in the room Mori presumed. The culprit has an alibi of talking to the nurse in another room at the time of the murder. Mori is desperate to go into the Sleeping Kogoro phase to prove his innocence and happily exclaims it's coming when Conan secretly shoots a tranquilizer dart. Conan disproves the culprits alibi and proves Mori to be innocent.