MIDNIGHT RUNNER Edge of Danger was "hugely entertaining," said the Los Angeles Times. "The publisher describes it as a powerful thriller, and it's no lie." At its end, the murderous Arab/English Rashid family lay decimated- but not extinct. And that may have been Sean Dillon's fatal error.  After her brothers are killed one by one, Kate Rashid swears vengeance on all who have harmed her family. Never mind that they tried to assassinate the President of the United States or that villainy ran in their veins. They were her brothers, and her enemies would pay. British agent Sean Dillon . . . White House operative Blake Johnson . . . and the President himself. . . . Their time was coming, and only she knew how-or when.  Masterfully suspenseful, Midnight Runner is further proof that, in the words of the Associated Press, "when it comes to thriller writers, one name stands well above the crowd-Jack Higgins."