Novels by Gordon Eklund 2

Hunting a traitor who defected to the Klingons, Kirk and his crew land on the quarantined planet Heartland, where small demonic creatures and a powerful disembodied mind offer immortality at a price.

The Enterprise finds Kirk's old Academy roommate adrift and insane, and follows his trail to a hollow world lit by a star at its center, now falling towards a black hole.