On the branch of the seeding ship Sigma, there is Ardena, an ocean planet where the incompatible was once combined. A prosperous industrial world whose inhabitants are doomed to live in isolation. A strange infection has been hovering over the world like a curse for centuries. Milana Hummel is a new agent in the ranks of an organization designed to prevent the strange consequences of this disease. She is purposeful, confident and superbly prepared. She doesn't like to remember her past. But an unexpected and cruel loss - a cold-blooded murder - takes away her future under truly mysterious circumstances. Backed into a corner, Agent Hummel decides to find the culprit at any cost - even if it means breaking the laws she once defended.