From Library Journal:

From Kirkus Reviews:

For seven decades, L. Sprague de Camp was a giant in both science fiction and fantasy, renowned for his fast-moving action-adventure tales with a strong humorous element. Now, Hugo-winner and best-selling author Harry Turtledove has gathered together top writers in SF and fantasy to write stories in the same humorous adventure vein which de Camp practically invented. On board are Poul Anderson, Frederik Pohl, David Drake, Judith Tarr, Esther M. Friesner, S.M. Stirling, Michael F. Flynn, Turtledove himself and more.

Every short story in this wonderfully varied collection has one thing in common: each features some alteration in history, some divergence from historical reality, which results in a world very different from the one we know today. As well as original stories specially commissioned from bestselling writers such as James Morrow, Stephen Baxter and Ken MacLeod, there are genre classics such as Kim Stanley Robinson’s story of how World War II atomic bomber the Enola Gay, having crashed on a training flight, is replaced by the Lucky Strike with profoundly different consequences.