There are 2 books in the 21 GUNS series. The newest book is Once Upon a Time in Fort Sumner which came out in 2022.

1
The Noted Desperado Pancho Dumez

By John Lemay , Logan Pack (illustrator) ,

Book cover of The Noted Desperado Pancho Dumez
THE OLD WEST'S MOST LEGENDARY LOST TREASURE...
AN OUTLAW'S STOLEN TOMBSTONE...
A DESPERADO'S GRAVE SECRET!

26 years ago, outlaw Billy the Kid’s tombstone was stolen from Fort Sumner, New Mexico. Now it has mysteriously been returned. When teenage brothers Pancho and Dorado Dumez steal it themselves, they get more than…
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2
Once Upon a Time in Fort Sumner

By John Lemay , Logan Pack (illustrator) ,

Book cover of Once Upon a Time in Fort Sumner
A serial killer who fancies himself a skinwalker,
a man who thinks he's Billy the Kid,
and a map to a lost canyon of gold...

The year is 1950, and old timers connected to the outlaw Billy the Kid are popping up dead in the sleepy town of Fort Sumner,…