The End of Eternity

Possibly Asimov's best work. I have long been a fan of Asimov as a mystery writer. End of Eternity fuses elements of time travel paradoxes and classic mystery storytelling to produce an outstanding work of scifi.

End of Eternity is the story of ruling class called Eternals, and how their attempt at social engineering leads to humanity potentially losing its soul. Ultimately an unintended act of rebellion by Technician Harlan (an Eternal) leads to End of Eternity or, as the ending says, the begining of infinity. A joyous read.