Shadow of Heaven (Star Trek: Voyager) (Dark Matters)

Shadow of Heaven is the twenty-first and final book in the main Star Trek Voyager series. It is also the third and final book in the Dark Matters mini series.
==Book Description==
The trilogy draws to a conclusion as "Voyager" races against time to gather a deadly contaminant. Whose side are the Romulans on? Where is the missing piece? And what surprising figure from the ship's past holds the key to the fate of the universe?
(Description from Amazon.com)