The Moonstone meets Black Sunday in this tale of terrorists plotting to bomb the New York auction of a fabled diamond Ilsa Nachtigal--just released from a German prison and determined to avenge her dead husband by attacking the widow of the politican whose bill executed him--learns that the widow  grasping Baroness Helene von Brandenburg  is putting the 85-carat Malabar Angel up for auction under the auspices of newcomer Charles Luttrell's Burnaby's auction house