The Two-Timers

Ace books, 1979. Later printing. First published in 1968. "A stunning novel of parallel worlds. If anyone needed incontrovertible proof that the fiction of wonder has come of age, Bob Shaw has provided it in one extraordinary novel of power, warmth, ideas and imagination. The Two-Timers says something fresh and memorable about the monomania of love, about the way we wear our universe, about a few of the eternal verities that suddenly seem less secure. Aside from the sheer impetus of the story, which grasps and won't release till the unexpected conclusion, the writing is exquisite. It knocked me painfully good." -- Harlan Ellison