Donald House Escape

Suppose that I was invited my partner to his home, for me to help him with the detailed design. There was no one but me and my friend. Late at night, in the cozy, luxurious house, I accidentally fell asleep. When I woke up, my friend was not there. He just went out somewhere and left me in a locked house. I knocked on the door and shouted in a loud voice, but there was no answer. What should I do?