A Call to Darkness (Star Trek: The Next Generation Book 9)

The Enterprise discovers a lifeless Federation research vessel, orbibting a planet hidden behind a mysterious energy shield. Over the strong objections of his senior officers, Captain Picard and an away team beam over in search of the missing crew --
And vanish.
But soon his captain's disappearance is not the only problem facing Commander Riker. For a mysterious disease has begun ravaging the Enterprise crew. Now Riker must uravel the secrets of the planet below in order to rescue Picard -- a prevent the starship's destruction.