World War I, a four year devastating conflict began in 1914 and engulfed all of Europe.

Where or When tells of its effects on the men who fought it, and of remaining issues that was unresolved for generations.  

Blaire Coolidge lives in the Pacific-Northwest city of Bellevue, Washington.  In the spring of 2009, she learns her great-grandmother Alice, had once married 1st Lieutenant David Reynolds of the embryo U.S Army Flying Corps. Her family objected to the marriage on the eve of David's departure for Europe and the war, but deeply in love, they went ahead.  David is lost in combat over the bloody trenches of France just a few months before the war ended in November, 1918. He reportedly went down in an area pulverized by artillery, hence his body was not recovered.  Post war attempts by Alice to find him netted nothing, so she returned home and eventually remarried.  With help from a German man, Klaus Meyer, Blaire comes upon an amazing revelation on the fate of David Reynolds.  

The tale meanders among Pacific Northwest settings, back and forth between the years 1918 and 2009 and other locations in the United States and Germany.