THE UNIVERSE HAS LESS THAN A CENTURY LEFT... UNLESS SPOCK CAN CHANGE HISTORY! The Enterprise is summoned to transport a dangerous criminal from Starbase prison to a rehabilitation center: brilliant physicist, Dr. Georges Mordreaux, accused of promising to send people back in time -- then killing them instead. But when Mordreaux escapes, bursts onto the bridge and kills Captain Kirk, Spock must journey back in time to avert disaster -- before it occurs! Now there's more at stake than just Kirk's life. Mordreaux's experiments have thrown the entire universe into a deadly time warp. Spock is fighting time . . . and the universe is closing in on itself with the relentless squeeze of... THE ENTROPY EFFECT