The Serbian Brotherhood headed by a man calling himself the Viper has arrived in Chicago, a city they see as the perfect place to establish their gun and drug smuggling businesses. But when the Chicago police raid one of their bases, the Brotherhood retaliates by setting up and destroying a SWAT unit. Cailan Bane and Dan Gabriel, a former top Recon Marine sniper team and owners of Imaginarium, a video game design outfit, pitch in to help police detective Harry Sanchez track down the Viper and drive the Brotherhood out of town. Yet someone else has a keen interest in the Serbian crime...