A Captive in Time (The Fourth Stoner McTavish Mystery)

In the Fourth Stoner McTavish Mystery by Sarah Dreher, Stoner gets lost in time... finding herself inexplicably transported to a town in Colorado Territory, circa 1871. There she encounters Dot, the saloonkeeper, Blue Mary, a local witch/healer, and an enigmatic teenage runaway named Billy. As Stoner tries to return home, her life is threatened and she starts to fall in love, out of time...