Where will we be one day, and what will we believe? How will we consider the world around us, and the people? How will we treat the known and the unknown, and possibly other intelligent lifeforms?
Whether close or distant future, something will be similar, and something… is very likely to be different.
A shape-shifter of some sort has taken up a post at the War College of an enemy realm, where he secretly picks off only the most promising officer cadets, arranging bizarre accidents that gradually debase the leadership of the hostile army. In the long run, this will improve his nation's chances when the inevitable conflict comes.
As a shape-shifter he can impersonate superiors and peers alike and send the target candidate to the cleverly-prepared site of his (or her?) execution. As long as he is successful, no-one will ever know about the deception--even necromancy will only implicate the one impersonated...