The AI wars have long passed and a fragile peace has settled over the AI and Human worlds. The differences that once kept them apart, now work to their mutual benefit. However, not all is well. The Empirium that governs them is wracked with constant attempts to upset the stability, thus forcing the ESSG, the Empirium's Security Guardians, to employ heavy measures to keep the PACT together.

Within this harsh environment, RIGA, a new biological AI, carves out a career for herself distributing her unique brand of justice to pirates and smugglers running the borders. The PACT between the different species means their Navy's hands are tied. RIGA has no such problem and with a modified one-person spaceship is more than able to slip the leash and maintain the status quo. Her job often requires diplomacy between the two species, but when that fails she resorts to her personal skills and bio-mods that enable her to keep on top in a fight.

The humans allow her onto their planets, which is essential for her missions, the AIs think she is a human too, so never see her as a threat (until it's too late). But, for RIGA, there is a big question mark over her origins - and something is tracking her - pushing her constantly onto the defensive.