The Steel Tsar

Oswald Bastable is travelling backwards in time from a shell-shocked Singapore to a Russian Empire seething with conflict and preyed on by motley bands of rogues and adventurers. Here he meets up with fellow-time-traveler Miss Una Persson, and together they change the course of a history whose legendary deeds exceed the bounds of everyday imagination and glitter in the exuberant land of the eternal present. (information from the back cover of the DAW edition)