Detective Conan S01 E885 Solving Mysteries at the Poirot Cafe (1)

"One truth prevails."

Conan and Heiji go to Poirot to while waiting for Ran and Kazuha. While there, a gathering of old friends is quickly interrupted by a power outage. During the blackout, one of them turns up stabbed with blood splattered everywhere. Yet, nobody has blood on them...