This is one of Fletcher Knebel's headline-deadline emergencies based on the conversion principle of potential diaster into a here-and-now actuality. A black man, Steele, and a group of militants take over the WASPish and bickering menage of wealthy Tim Crawford and his wife Liz who live in a three-quarter million dollar house in Princeton. Before long it becomes apparent that this is only one of six invasions headed by the Blacks of February 21st whose messiah has a larger area in mind--GAMAL (Georgia, Alabama, Mississippi and Louisiana). President Randall makes firm remonstrances over the tube while organizing armed force; Ginny Jones, a soul sister and singer of wide appeal (whom Crawford had once tumbled in Mexico) urges the Blacks onward; all the old bugaboos surface and token PTA liberalism is put down along with the violence. . . . Not as successful as Vanished in terms of action and then there's the mundane prose. However, the utter predictability will include the fact that it GOES without saying . . . anything else.