Maximum Warp Book Two: Forever Dark (Star Trek The Next Generation, No 63)

In a distant region of the galaxy, Picard and his treacherous Romulan allies discover the source of the subspace crisis, a huge alien mechanism suspended between a black hole and a nearby inhabited planet, and Picard finds himself confronted with a difficult choice sacrificing a wolrd and saving the rest of the universe from the device's cataclysmic impact. Original.