INFINITE by Jeremmy Robinson.
Here is the description from Amazon:
The Galahad, a faster-than-light spacecraft, carries 50
scientists and engineers on a mission to prepare Kepler 452b, Earth's
nearest habitable neighbor at 1400 light years away. With Earth no
longer habitable and the Mars colony slowly failing, they are humanity's
After 10 years in a failed cryogenic bed - body asleep, mind awake -
William Chanokh's torture comes to an end as the fog clears, the hatch
opens, and his friend and fellow hacker, Tom, greets him...by stabbing a
screwdriver into his heart. This is the first time William dies.
It is not the last.
When he wakes from death, William discovers that all but one crew
member - Capria Dixon - is either dead at Tom's hands, or has escaped to
the surface of Kepler 452b. This dire situation is made worse when Tom
attacks again - and is killed. Driven mad by a rare reaction to extended
cryo-sleep, Tom hacked the Galahad's navigation system and locked the ship on a faster-than-light journey through the universe, destination: nowhere. Ever.
Mysteriously immortal, William is taken on a journey with no end,
where he encounters solitary desperation, strange and violent lifeforms,
a forbidden love, and the nature of reality itself.
...he discovers the infinite.