Holobrain - The Evolved, #5

As the Evolved invaders conquer more and more of Peregrine space, Arvada Sattar and Sahan Kotori go on fighting their own war in defiance of Naval Command. While Arvada develops tactics for ambushing the enemy from deeper in the sun than anyone thought a starship could survive, Sahan carries on his hazardous mental penetrations of the enemy holobrain. When the Viveca becomes trapped inside a singularity alongside a much more powerful Evolved ship, Arvada leads the crew in hand-to-hand fighting against the enemy's Grinder infantry.
But heavily outnumbered, only one hope remains. Sahan must enter the enemy holobrain and engage the Evolved Captain in a brutal psychological combat that plunges them both into the holobrain's dread "Terror Barrier."But like a black hole, what enters the Terror Barrier can never escape.