The Mercy is sent to investigate to determine who and what is sending the signal.  As the Mercy gets closer, they detect a signal on every frequency from Starfleet to Romulan to Klingon to Ferengi…to everyone.  Its message is simple – “DEATH HAS COME.  PLEASE COME.”  The ship arrives, and they discover a moon base in disrepair with a complicated history and a malfunctioning central computer but still fully operative and suddenly powered.  The message contains additional code, and signals come in from the sector’s moons, asteroids, and even a desert planet over several days.  Something has survived the last 200 years, but what is it?  What is the meaning of the message?  The crew must use all their wits to discover the truth – whatever that may be!