Species Imperative - La série

When her Field Base is mysteriously attacked, Dr. Mackenzie Connor must flee for her life. Joining forces with an alien archaeologist, she escapes to his planet on a quest to find a defense against the unknown agressor-before they launch a full-scale invasion of Earth.

Senior co-administrator of the Norcoast Salmon Research Facility, Dr. Mackenzie Connor was a biologist who studied the spawning habits of salmon. Then, last season, just as she and Dr. Emily Mamani were starting their research, they were interrupted by the arrival of Brymn, the first Dhryn to set foot on Earth. And suddenly everything changed for Mac, Emily, Brymn, the human race, and all the member races of the Interspecies Union. Base was attacked, Em was kidnapped by the mysterious Ro, Mac nearly lost her life when she and Brymn escaped to the peaceful, isolationist Dhryn home world. But the Dhryn are in the process of abandoning it, hurtling out on an unfathomable path of destruction through civilized space. As the enemy destroys life on planet after planet, the IU organizes a secret Gathering of every being with information on the Dhryn. With the data available there, Mac begins to suspect that the Dhryn's actions may be a response to something simpler and more deadly—the imperative to migrate. But even if Mac is right, can she and her team discover why this is happening and how to halt the Dhryn?

With the alien Dhryn cutting a pathway through the inhabited spaceways-bringing about the annihilation of many of the races who have the misfortune to lie along the star trail they are following-time is running out for all sentient life-forms. Can biologists Mackenzie Connor and Emily Mamami solve the riddle of the Dhryn before their part of the galaxy becomes as dead as the mysterious region known as the Chasm?