The Lunion Shield Worlds

From publisher blurb:

The ‘Lunion Shield Worlds’ is an unofficial term referring to a group of star systems on the border between the Third Imperium and the Sword Worlds Confederation.

Although they form part of the Spinward Main, these worlds are very much a backwater and frontier. Few major corporations are keen to invest in a region that will surely be a battleground in any future war, leaving opportunities for smaller firms and private operators to move in and take up the slack. The Shield Worlds are a high-risk environment, but risk and reward go hand in hand… at least, sometimes.