Fusion

When Captain Janeway orders the investigation of a peculiar and dangerous anomaly tied to an alien civilization, it sets in motion a chain of events bridging Voyager's past with its future, forcing choices upon the crew with terrible repercussions, and discoveries beyond their wildest expectations. In this second novel of an exciting 3-part odyssey, Tuvok, Voyager's Vulcan security chief, answers a cosmic siren song that puts him on the verge of startling transformation, testing the crew's continued cohesion by challenging its assumptions about loyalty, duty, free will, and friendship.