In this so-called freest federation, an invisible thread hangs above everyone's head. Anyone who crosses the line must die.
The protagonist Ian Varese was originally a knife of the Federal Special Stability Audit Office, responsible for determining who would threaten federal stability and who should be included in the "grey line."
It wasn't until he found out in a series of "legal death" cases that his late father was also a line breaker who was silently handled by the gray line that he realized:
What he has served for many years is not order, but a slaughtering machine cloaked in freedom.
