There are 5 books in the The Clockwork Century series. The newest book is Fiddlehead which came out in 2013.

1
Boneshaker

Book cover of Boneshaker
At the start of the Civil War, a Russian mining company commissions a great machine to pave the way from Seattle to Alaska and speed up the gold rush that is beating a path to the frozen north. Inventor Leviticus Blue creates the machine, but on its first test run…
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2
Dreadnought

Book cover of Dreadnought
Nurse Mercy Lynch is elbows deep in bloody laundry at a war hospital in Richmond, Virginia, when Clara Barton comes bearing bad news: Mercy's husband has died in a POW camp. On top of that, a telegram from the west coast declares that her estranged father is gravely injured, and…

3
Ganymede

Book cover of Ganymede
The air pirate Andan Cly is going straight. Well, straighter. Although he's happy to run alcohol and guns wherever the money's good, he doesn't think the world needs more sap, or its increasingly ugly side effects. But reforming is easier said than done: the captain's first legal gig will be…

4
The Inexplicables

Book cover of The Inexplicables

Rector "Wreck ‘em" Sherman was orphaned as a toddler in the Blight of 1863, but that was years ago. Wreck has grown up, and on his eighteenth birthday, he'll be cast out out of the orphanage.

And Wreck's problems aren't merelyabout finding a home. He's been quietly breaking the cardinal…

5
Fiddlehead

Book cover of Fiddlehead

Young ex-slave Gideon Bardsley is a brilliant inventor, but the job is less glamorous than one might think, especially since the assassination attempts started. Worse yet, they're trying to destroy his greatest achievement: a calculating engine called Fiddlehead, which provides undeniable proof of something awful enough to destroy the world.…