A serial killer stalks the streets of 1950s Boston -- and two friends take it upon themselves to bring him down. Post-war Boston is down on its luck and looking for change. A year after the Great Brink's Robbery -- the largest robbery in the history of the United States -- Boston is known more for its seedy underbelly than for its rich, historical past. The winter of 1951 is the worst in recent memory, and the Bruins are suffering another losing season. Like Boston itself,