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Modesitt, L. E., Jr. Of Tangible Ghosts. Tor 1995.

Modesitt, L.E., Jr. Ghost Stories
What if: Henry VIII was overthrown in favor of his Catholic daughter Mary. Later, the Mayflower colony succumbed to plague, and without the British presence in New England, Dutch colonies prospered. Also, ghosts exist as an everyday fact of life.
Series note: Series containing Of Tangible Ghosts, The Ghost of the Revelator, and Ghost of the White Nights. The first two volumes are collected in Ghosts of Columbia.

Modesitt, L.E., Jr. Of Tangible Ghosts
Summary: In the late 1900s, a former secret agent turned university lecturer is embroiled in a murderous plot involving ghost research, spies from New France and European superpower Austro-Hungary, and a political turf battle between Columbia's president and speaker.
Series note: First of Modesitt's Ghost Stories.
Published: Tor 1994 (0312857209), 1995 (0812548221w88 android), 2010 (0765336154BUY)
— Included in Ghosts of Columbia, Tor 2005 (0765313146BUY).

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Modesitt, L. E., Jr. The Ghost of the Revelator. Tor 1998.

Modesitt, L.E., Jr. The Ghost of the Revelator
Summary: A year later, when his wife is invited to sing in Great Salt Lake City, our hero is involuntarily drawn into a political morass involving Columbia, Deseret, and New France energy resources and renegade Saints.
Series note: Second of Modesitt's Ghost Stories.
Published: Tor 1998 (0312864264BUY), 1999 (0812545362BUY).
— Included in Ghosts of Columbia, Tor 2005 (0765313146BUY).

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Modesitt, L. E., Jr. Ghost of the White Nights. Tor 2001.

Modesitt, L.E., Jr. Ghost of the White Nights
Series note: Third of Modesitt's Ghost Stories.
Published: Tor 2001 (0765300958w88 androidBUY), 2002 (0765340321BUY).

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Modesitt, L.E., Jr. Ghosts of Columbia. Tor 2005.

Modesitt, L.E., Jr. Ghosts of Columbia
Series note: Omnibus volume including Of Tangible Ghosts and The Ghost of the Revelator.
Published: Tor 2005 (0765313146BUY).