As the Evolved continue to hammer away at Earth's colonies, Peregrine Captain Arvada Sattar now leads a fleet of ships in rebellion against their own government's demand to surrender. Driven to desperate tactics, she plunges her ships into solar atmospheres right to the edge of their survival margin. Then beyond.

Continuing his explorations into the Evolved Group Mind, Sahan encounters "the Terror Barrier." He believes it may provide the key to victory. The catch? Like a Black Hole, whatever enters the Terror Barrier can never escape.

Then the voice of a long-dead Peregrine emerges amid the chaos, offering to lead him. To victory? Or to share her all-too-evident madness?

The fifth book in the epic science fiction series The Evolved, Holobrain brings the saga into new dimensions of both space and mind.