The first entry in a new series with three big, all new linked novellas from multiple best-sellers Harry Turtledove, John Ringo and Jody Lynn Nye, S.M. Stirling, and Michael Z. Williamson!

After the extinction asteroid doesn't strike Earth, the dinosaurs keep evolving... but so do the mammals. We mammals have achieved human-like shapes, but now it's cold-blooded, magic-using reptiles against the hot-blooded, hot-tempered descendants of cats.

In a heroic, bronze-age world similar to 300, the Mrem Clan of the Claw and its sister warbands are expanding their rough-and-tumble territory, but now they face the Lishkash, masters of a cold-blooded empire of slave armies and magic. It's mammalian courage and adaptation against reptile cunning in a clash of steel and will that will determine which line shall inherit the Earth.