|Series||Star Trek: The Original Series|
|Genre||Science fiction novel|
|Media type||Print (paperback)|
|ISBN||0-671-68403-5 (first edition, paperback)|
|Preceded by||Doctor's Orders|
|Followed by||Home Is the Hunter|
The novel was originally set before "Where No Man Has Gone Before", but had to be rewritten at a late stage to be set after Star Trek: The Motion Picture, due to Paramount insisting that the Deltas were not part of the United Federation of Planets in that era. 
The Enterprise is assigned to carry a diplomatic mission, which is nothing new. Things start to go really wrong for this one. The Federation ambassador is an old 'flame' of Kirk's, who aggressively tries to rekindle their old romance. Another diplomat presents Kirk with three of his wives, a situation he is not comfortable with. Things take a turn for the worse when another diplomat is found killed.
- Cheeseman-Meyer, Ellen (Jun 4, 2013). "What Happens When Spock Goes Away: V.E. Mitchell's Enemy Unseen". TOR. Retrieved 9 October 2014.
- Ayers, Jeff (2006). Voyages of the Imagination: The Star Trek Fiction Companion. Pocket Books. ISBN 1-4165-0349-8.
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