The Aethers of Mars

Welcome to Mars.circa 1900. Cecil Rhodes rules Mars and is on his way to transforming the British Empire into his vision of a powerful force, managed by the "right" type of people. But what of Savinkov.presumably on board the British aethership Agincourt, traveling from Earth to Mars? Savinkov is a legendary revolutionary and assassin and, with Russian secret agents hot on his heels, is reputedly planning something truly dramatic and Mars-shattering.
This is the sixth book in the Stellar Guild line.