Medusa

In the thrilling conclusion of the tetralogy, Earth faces alien surveillance from the Warden Diamond, a cluster of four worlds. Due to microscopic symbionts, agents cannot leave the Diamond, prompting a desperate plan to send individuals with erased memories, controlled by Confederacy agents. As Tarin Bul and his controller venture into the frozen world, they confront the formidable powers of the despised dictator, Lord Ypsir. The stakes are high as they race against time to complete their mission and uncover hidden dangers.