John Tanner, network news director, is looking forward to a weekend party with his closest friends - the Ostermans, the Tremaynes and the Cradones. But then the CIA tell him that they are all suspected Soviet agents: fanatical, traitorous killers working for Omega, a massive Communist conspiracy.
From this moment, Tanner and his family are caught up in a nightmare whirlpool of terror, helpless isolation, violence and bloody slaughter. Until the shattering climax, Tanner cannot know who are his friends and who are his implacable, deadly enemies.
