Quest Crosstime

On an Earth exactly similar to ours geographically, but in which events of history and society took strangely different turns, Blake Walker found himself involved in a QUEST CROSSTIME. Born in the Earth we know, Blake had become a citizen of that alternate world and thought himself trusted until the mysterious disappearance of his patron's daughters, the rebellion of the time-travel engineers, and the outburst of a plot to use the secret of time to loot a hundred unsuspecting worlds. Blake's search through alternate Earths, his daring adventures with alien empires and hostile beings, all combine to make this one of Andre Norton's most unusual and exciting novels.