The Heart of the Beast (A Sci-Fi Novelette #5)
by Marco Guarda
After a strategic spaceship carrying enough warheads to blow half the solar system to pieces disappears into nothing, Captain Mark Sanders is appointed with the suicide mission of tracking it down and destroy it.
It's a Sci-Fi Novelette of about 10,500 words.
* This novelette is also contained in Collected SCI-FI STORIES - Pack 1