There are 4 books in the Mark Twain on the Moon series. The newest book is The Notorious Jumping Frog of Lobster Gulch which came out in 2024.

1
Prospectors!

Book cover of Prospectors!
Now a steampunk bestselling series!

In an alternate 19th century, young Samuel Clemens sets out for the mining camps of America’s wildest frontier: the Moon. Travel with Sam and his partner Calvin as they venture into the desolate, deadly wastes of the Mare Imbrium and the Montes Caucasus, in search…
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2
The Deirdre

Book cover of The Deirdre
The amazing, perilous, sometimes hilarious adventures of Samuel Clemens on the Moon continue in The Deirdre, book two of the Mark Twain on the Moon saga.At the end of book one, Prospectors!, Sam and his partner Calvin found themselves stranded in a remote crater, down to their last cylinder of…

3
"Home"

Book cover of "Home"
Driven out by a violent band of claim-jumping miners, Sam Clemens and his partner Calvin strike out into unexplored Lunar territory - and now they're heading the expedition! But when disaster threatens their former colleagues, the Clemens-Bemis Expedition must take on refugees. With supplies running short and dissent rising, is…

4
The Notorious Jumping Frog of Lobster Gulch

Book cover of The Notorious Jumping Frog of Lobster Gulch

Freshly escaped from the caverns of "Home," the Clemens-Bemis Expedition welcomes two young women: bold Hazel and resourceful Conifer. Their journey starts with a bang when they dynamite their way free of the Vallis Alpes, hot on the heels of a renegade member turned outlaw. The pursuit lands them in…