A Bride’s Deception: A Mail Order Bride Mystery Romance (Wagon Wheel Justice Book 1) by Blythe Carver

When Uncle Gabriel dies, Sadie Salinger and her sisters find themselves owning a detective agency. Complete with a case ready to go. Adelaide’s come up with an idea. Masquerading as a madame and a lady of the night. Sadie’s the one who has the gumption to pull off the ruse, so it’s settled. She and Adelaide will go to a mining town to solve the mystery Uncle Gabriel left behind.

Larson Donaldson’s not a lawman anymore, but that doesn’t mean he doesn’t need to eat. Of course, he does, so he gets himself a job as private security for a madame and her sportin’ woman. He’s never had a job quite like this one. Then again, he’s never met a woman quite like Sadie Salinger.

Things seem fine until an attempt is made on their lives. That’s when he determines he needs to know the truth. He can’t protect the women when he doesn’t know what in creation’s name they're actually doing in this mining town.