Test your logline here at "Logline It" before spending months or years on developing your script. This is not a contest, there are no prizes. However, you WILL get invaluable help in sharpening your concept and refining your logline.
Have you considered changing the concept slightly? What if another lieutenant kills the boss, and he stands to take the blame. This way, his vie for power could become a means of survival rather than a murderous rampage for the sake of it.