Once Upon a Time in the Wyrd West (Wyrd West Chronicles #1-6)

In a post-apocalyptic Saskatchewan, the Gunslingers are a holy order of Law empowered to keep the peace and protect the common people. They have supernatural powers to back it up.

The Walsh siblings are about to find themselves entangled in the nefarious schemes of a necromancer! But they're not Gunslingers -- not yet. Graeme and Piper will need all of their training and courage, and all the support of their newfound companions, to put a stop to the villain's plans. Fortunately, Graeme has an ace up his sleeve. Nobody but his family and his teacher know that he's a sorcerer.

Welcome to the Wyrd West, where Western meets high fantasy and a dash of steampunk.