Call to Arms, A (Babylon 5) by Robert Sheckley - Vintage Paperback

"When the time comes to choose your target, be sure to pick the right one. Because you will only get one shot . . ."

The Shadow War is long over, and the Interstellar Alliance--presided over by former Babylon 5 commander John Sheridan--is about to celebrate the fifth anniversary of peace among its united member worlds.

But a planet, annihilated by an unspeakable weapon appears in chilling dreams. And on that world there lies a terrifying promise of Armageddon. For the Drakh, once servants of the bloodthirsty Shadows, are following in the footsteps of their vanquished masters--preparing to launch a devastating interstellar war. Their first target is Earth.

This threat will draw Sheridan back to Babylon 5--and into an uneasy partnership with a beautiful and deadly survivor of Shadow genocide. In the desperate race to warn Earth, he must face an apocalyptic showdown with the ultimate war machine--one capable of killing an entire world . . .