Gita Chithra, the captain of the intergalactic ship The Tempest, is used to leading her crew on simple retrieval and assistance missions. But when she receives a frantic distress call from Ri, the AI she trained from inception--making her like a daughter to Gita--she knows she's in for something much more dangerous.

Ri is trapped in the depths of Loki's Ring, an artificial alien-made solar system, and says everyone in the vicinity has been infected and killed by a mysterious contagion. Gita and her team investigate, only to discover horrors at every turn, and are soon stranded themselves, leaving them vulnerable to infection and attack.

Forced to call on an old friend to help them out of this mess, Gita must succeed or risk losing everyone she's ever loved.