Imzadi: Star Trek: The Next Generation

Years before they became crewmates on the U.S.S. Enterprise, Commander William Riker and ship's counsellor Deanna Troi had a tempestuous love affair on her home planet of Betazed. Now, as their passions have cooled, the two serve together as close friends. Yet the memories of what passed between them linger and Riker and Troi remain Imzadi, a powerful Betazoid term that describes the enduring bond they still share. On a delicate mission involving negotiations with an aggressive race called the Sindareen, Deanna mysteriously falls ill...and dies. But her death marks the start of an incredible adventure for Riker - an adventure that takes him across time, pits him against one of his closest friends, and forces him to choose between Starfleet's strictest rule and the one he calls Imzadi.