Good book, not Blaylock's best but as good as his other one in this series, Homunculus.
"What's so special about Lord Kelvin's machine? The diabolical Dr. Ignacio Narbondo would kill to possess it. The accomplished scientist and detective Langdon St. Ives would do anything to use it. For within its magical gears lies the secret of time...the means for Dr. Narbondo to master the world...and the method by which St.Ives can avert the doom of his beloved wife. A devilish race against time, indeed. Especially when arch rivals of the present meet their future in the past!"