Two best friends Meg and Samantha, live in the same room of the college dormitory. Samantha goes out for a party with her date while Meg stays back to study for the upcoming mid-term exams. When Samantha returns from the party, lights are all turned off. She does not switch on the lights as her friend is asleep.
Early in the morning, Sam tries to wake Meg up to discuss the exams. As Meg doesn’t respond, Sam hesitantly uncovers her face to wake her up. She gets horrified to discover Meg’s face turn black and blue, and falls on the floor in a state of shock. She observes that Meg’s study table was all messed up and finds a note on the wall, “Aren’t you glad you didn’t turn on the lights?” The murderer must have very much been in the room when Sam came the previous night.