1. Melanie wants to ambush the Butcher for killing her brother. She wants you to hide somewhere and then jump out when he returns. So investigate the sofa. There’s a loose floorboard under the sofa. Pry it open with the knife. There’s a fuse box with a clue on it:
2. The letters stand for numbers (Nine, Eight, Seven…). The numbers next to the combination lock stand for the numbers in that sequence. So unlock the fusebox:
3. Flip the switch to see that it can shut the lights. Then leave from under the couch and talk the Melanie. The Butcher is back. Hide under the couch and flip the switch in the fuse box. Then you’ll see him writing something on the wall. Attack him with the knife and he’ll fall, dropping the lighter. Pick it up.
4. I used the knife again to kill him, and then discovered Melanie is really the Butcher (“Ellie,” anyone?). The room fills with poison gas and you pass out again.