The title is an accurate hint that this is another Dumas homage. It's slowed down in its opening third by needing to explain much of Edgerton's clockwork-complicated world, but it gains speed and dash as it goes on. I thought it had all the charms of Edgerton's The Gnome's Engine, for instance, and a lot more excitement.
The politics and fashion feel a bit later than the Musketeers' setting, and perhaps a bit more Germanic. The states are small, there is more urban immiseration than rural (or swashbucklers don't plot in the turnip-fields), and the clockwork (though putatively the legacy of a decayed magic) follows the fashion of the late 18th century. This is style, not plot, though; the trends we think of as arising with the Enlightenment aren't important here. They are more used in Gnome's..., which might be why it's more tasteful and slow.
ISBN: 0380789116
So wrote clew in SF&F.