Peter David 
Star Trek: New Frontier: Being Human 

From the universe of Star Trek: The Next Generation! Throughout the Star Trek: New Frontier saga, Mark Mc Henry, the navigator on the U.S.S. Excalibur, has demonstrated abilities beyond those of the somewhat odd human being he appears to be. When the inhabitants of an innocent solar system are confronted by a menace linked to the source of Mc Henry’s powers, his true heritage is revealed at last. Meanwhile, Zak Kebron is going through a startling change that will leave him both more and less than he was.