Case Closed (1996)

Season 10

Episode 13: The Truth Behind Valentine's (The Reasoning)

The mystery continues and they develop the film on the camera to find droplets of blood on it. Apparently the murder takes place before the snowstorm but Conan feels like there's a trick to it. The characters are given more back story. While examining the chocolates, Conan figures out who the murder is. Mouri pops in finding Conan snooping around and is put to sleep. Conan tells everyone in the house Mouri is ready to place his deduction.