Written late in his career and while at the height of his powers, KNOCK-THREE-ONE-TWO is Fredric Brown 's tour de force of suspense. Taking place over the span of a single evening, we find a city enflamed by fear. A serial killer is on the loose, and while the maniac ties the city into knots, the lives of ordinary citizens are drawn into an inescapable spiral of greed and chance. Brown, purveyor of the surprise ending, does not disappoint. Step now into a world of shadow and anxiety. You need only knock 3-1-2.