There are 3 books in the The Hexslinger series. The newest book is A Tree of Bones which came out in 2020.

1
A Book of Tongues

Book cover of A Book of Tongues
"Gemma Files has one of the great dark imaginations in fiction visionary, transgressive, and totally original." -Jeff VanderMeer

In Gemma Files's "boundary-busting horror-fantasy debut," former Confederate chaplain Asher Rook has cheated death and now possesses a dark magic (Publishers Weekly). He uses his power to terrorize the Wild West, leading…
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2
A Rope of Thorns

Book cover of A Rope of Thorns
The second book in the "top-notch horror-fantasy saga," following A Book of Tongues, is "a spectacular blend of Aztec religion and Western gunslinging (Publishers Weekly).

Welcome to Hex City. Population: magicians. Thanks to hexslinger "Reverend" Asher Rook, sorcerers now have a sanctuary where they can live and work in peace.…

3
A Tree of Bones

Book cover of A Tree of Bones
"The rousing conclusion to Files's remarkable Hexslinger trilogy . . . A bravura performance" from the author of A Book of Tongues and A Rope of Thorns (Publishers Weekly).

A new Civil War is brewing. With the city of Bewelcome as its headquarters, Allan Pinkerton's Detective Agency leads a siege…