Massive computer malfunctions are plaguing the Enterprise when Kirk suddenly receives a shocking message from Starfleet Command: "Centaurus has been bombed and annihilated. Thousands are dead. Give whatever help you can." The crew risks beaming down to investigate. But Kirk is thrown into a deadly struggle between violent enemy terrorists and vengeful Centaurians.

Now Lt. Uhura, left alone in command, must jeopardize the crippled Enterprise to save Centaurus, Kirk -- and Joanna McCoy!