The post - apocalyptic world was filled with ruins of the old civilization. There were no more governments or laws. A group of survivors had made their home in an abandoned skyscraper. Among them was a boy named Max. Max was fascinated by the old technology that still lay scattered around. One day, he found a device that looked like a communication tool. He tinkered with it and accidentally sent out a signal. Soon, they were contacted by another group of survivors from across the ocean. But not all was as it seemed. The other group had a different ideology and wanted to take over the skyscraper. Max and his friends had to decide whether to fight or find a way to co - exist with the new arrivals.