You are an elite sniper for GATO (global anti-terrorist organization), and an unsung hero in the war against new terrorism. Three months ago, you stopped a biological missile attack with a last minute bullet. Now, a new threat is emerging. HEAVEN, the world's largest and most well connected global terrorism group is preparing for action. Retirement is no longer an option. A mysterious phone call convinces you to get back on the job, and join GATO's new special forces unit, GST.