Priority Mail embodies all the best elements of a riveting true-crime story: steadily building suspense, behind-the-scenes investigative work, and compelling, complex characters. From the beginning, inexperienced ATF agent Brian Hoback and a handful of others suspected the brilliant, charming, and chilling Walter Leroy Moody; but if Moody was the bomber, he had expertly covered his tracks. Hoback, however, never gave up on his quarry, even when senior officials and dozens of other agents mistakenly focused on another suspect. The key was whether Moody's much younger wife, Susan, could be transformed from devoted helpmate - and battered wife - to stunning star witness for the prosecution, throwing off the influence of her domineering husband and testifying against him.