The Reluctant Bride (Brides Along the Chisholm Trail #1)
Maxine Douglas

Logan Granger is a Pinkerton Detective assigned to Dodge City area as an undercover bartender. When his mail-order bride, “Abby,” steps off the train she doesn’t fit the description of a matronly woman who has agreed to his marriage contract of no emotional attachments. There’s no time to reconsider, the preacher is waiting to marry them.
Rose hadn’t expected the handsome man waiting for her to be a bartender with a six shooter on his hip and a badge on his chest. Logan hadn’t expected his soon-to-be wife to be young, beautiful, and a runaway murder witness.