The Shocking Secret, by Holly Roth (epub/Kindle/pdf)
"An astonishing book: don’t miss it." --BOSTON GLOBE
In the treacherous maze of post-war Berlin, beautiful Ellen Content mysteriously disappeared. John Terrant, her fiancee, was told by American Intelligence that she would contact him when her "job" was finished. She never did.
Terrant waited. For a year-and-a-half there was no other course. Then he found one clue to Ellen's whereabouts. And after eighteen inactive months, suddenly every moment counted. Short days later, Terrant's search ended -- in a blaze of bullets!
(Also published as The Content Assignment.)