Alice screwed her eyes shut, forced the memories away, and turned from the view of a frigid Manhattan. She unsheathed the riot gun, hung it on her tactical sling, and pulled a new battery pack from a thigh pocket. It clicked home with a low-pitched buzz as the cartridges accelerated. She took a small silver key from another pocket. In one smooth movement she crossed to the metal mesh door, inserted the smart key until it pulsed, then dragged it open and ducked inside.