Case Closed (1996)

Season 5

Episode 4: Recipe for Murder Part 1

Ran takes a French cuisine cooking lesson in Sonoko's absence and Conan and Kogoro tag along. There is a blackout while Conan and Kogoro head to the washroom and they find someone purposely tripped the circuit breaker using a weight and block of ice. Returning to the kitchen, the teacher is on the floor claiming to have trouble breathing and Conan discovers she's been punctured in the back. The police investigate and find evidence the attacker was someone from inside.