Books in the Ghost Trilogy series

Bestselling author L. E. Modesitt, Jr. begins his Ghost Books series with Of Tangible Ghosts in a strange alternate reality where ghosts are no longer mere superstition, but physical realities.When two real ghosts and the records of a murdered researcher enter the life of Johan Eschbach, the former spy and present professor finds himself caught with the secret of high-technology de-ghosting, and the whole world, including his former spymasters, try to turn Johan himself into another ghost.The Ghost Books#1 Of Tangible Ghosts#2 The Ghost of the Revelator#3 Ghost of the White Nights#1-2 Ghosts of ColumbiaOther Series by L.E. Modesitt, Jr.The Saga of RecluceThe Imager PortfolioThe Corean ChroniclesThe Spellsong CycleThe Ghost BooksThe Ecolitan MatterThe Forever HeroTimegod's WorldOther BooksThe Green ProgressionHammer of DarknessThe Parafaith WarAdiamanteGravity DreamsThe Octagonal RavenArchform: BeautyThe Ethos EffectFlashThe Eternity ArtifactThe Elysium CommissionViewpoints CriticalHazeEmpress of EternityThe One-Eyed ManSolar Express