You cautiously move toward the source of the sound. "Who's there?!" you ask sharply.
The shuffling sound stops abruptly. You hear a soft gasp. "Oh, thank goodness!" the voice says. The person moves closer. A soft green light suddenly illuminates the figure of a girl about 13 years old, who is squeezing the indigo light of her wristwatch. She is Asian, with wispy black short hair. Her face looks dirty and haggard.
"I'm Erika," the girl says. "I've been in here for 3 days now. I was called here to pet-sit, but I soon learned that was just a trick. Mr. Alexander nearly killed me, but then his wife said something about me being 'unstable', and then he threw me in here."
"We're in a similar situation," you say, and tell Erika about how you and Sophie came to be where you are.
"I don't know what's going on here, but it's something horrible," Erika says when you are done. "Listen, I think I found a way out. I've been pushing some loose bricks, but I'm pretty exhausted from not eating, so I can't move them anymore." Just then, her stomach growls loudly, and she smiles weakly.
You and Sophie move to the place she was talking about and start moving bricks. It only takes a few minutes of the two of you lifting to make a big enough hole in the wall. You, Sophie, and Erika quickly squeeze through the tunnel. To your relief, it surfaces at a sewer grate out on the road, and the three of you hurry to your car.
You go to the police, and even though at first, they are doubtful, they finally believe your wild story and go to the house to investigate. They find it in blazes. The fire department struggles to subdue the flames. The house is eventually completely destroyed. Search crews later find dozens of burned bodies and human remains, and strange occult paraphernalia.
You, Sophie, and Erika sell the rights to the story, and it is quickly made into a horror movie. You never really understand what really was going on in that mansion, but it doesn't matter. You are now safe, and a millionaire!