THE TIPPING POINT is the biography of an idea, and the idea is quite simple. It is that many of the problems we face - from crime to teenage delinquency to traffic jams - behave like epidemics. They aren't linear phenomena in the sense that they steadily and predictably change according to the level of effort brought to bear against them. They are capable of sudden and dramatic changes in direction.
On a cold, miserable night in Michigan’s Upper Peninsula, a night that wouldn’t feel so unusual if it wasn’t the Fourth of July, an antique wooden boat runs full-speed into a line of old railroad pilings in the shallow waters of Waishkey Bay. When Alex McKnight helps rescue the passengers, he finds three men. The driver is out cold, the other two are dazed but conscious. When they’re all finally back on dry land and sent...