Enter the house, nobody is home

You open the door and slowly step inside. Glancing around, you look for a light switch. Finding one near the door, you flip it on. A large chandelier in the middle of the room lights, but dimly. You stare in awe at the grandeur of the entryway, the high vaulted ceiling, the marble floors, the grand staircase in the center of the far wall. The place looks to be straight from a movie. You take a few more steps forward and the door slams shut behind you, causing the dim lights to flicker. What do you do?