Walking up to the building felt like an eternity. One, because I was a little nervous and two, because my leg hurt and I was walking slow. 
Em got to the building first. I could see her up ahead, peeking through windows that looked coated in dust. 
"It's empty." She shrugged her shoulders, looking back at us then towards the windows again. Spencer caught up to his sister, eager to look inside. His forehead was almost pressed against the window, his hands planted firmly on the dirty glass.
"Identify yourselves in ten seconds or we blow you away." A loud shout came from above. I looked up towards the roof, but I saw no one. Nervous, I looked back at Sam, unsure of what was about to happen to us.