Critical Interference - The Sentinel Saga, #2

War is on the horizon. It's getting closer by the day, and seems unavoidable. This may be the big one. The Sentinel is in pursuit of his second target: a mysterious person who makes deliberate changes to history by doing nefarious things, up to and including fomenting and perpetuating wars. Coincidence? Doubtful. The clock is ticking. If the Sentinel can't unravel and counter these troublesome activities in time, the world may be lost in a nuclear winter.