Star Trek: Early Voyages #16: Thanatos

Under Cover Captain Christopher Pike, Phillip Boyce and Spock have infiltrated a Temazi temple in order to find Klingons who are also in disguise as Temazi people.  The Temazi will kill any off worlders and so the team has to find the Klingons before the Klingons find some ancient technological weapons.
 
Meanwhile in orbit of the planet Robert April feels that Pike's crew is under par including the acting Captain Number One.  He is obviously wrong but he is also correct as the crew seems to raising tensions around the new crewman Shane Samson in engineering.