One Came Home (Amy Timberlake)

Summary: In the town of Placid, Wisconsin, in 1871, Georgie Burkhardt is known for two things: her uncanny aim with a rifle and her habit of speaking her mind plainly.

But when Georgie blurts out something she shouldn't, her older sister Agatha flees, running off with a pack of "pigeoners" trailing the passenger pigeon migration.  And when the sheriff returns to town with an unidentifiable body--wearing Agatha's blue-green ball gown--everyone assumes the worst.  Except Georgie.  Refusing to believe the facts that are laid down (and coffined) before her, Georgie sets out on a journey to find her sister.  She will track every last clue and shred of evidence to bring Agatha home.  Yet even with resolute determination and her trusty Springfield single-shot, Georgie is not prepared for what she faces on the western frontier.  (from amazon.com)

Where can I find it?: Boston Public Library: Brighton, Copley, Honan-Allston, Hyde Park, Roxbury, Uphams Corner, and West Roxbury branches, or as an ebook at https://bpl.bibliocommons.com/v2/record/S980C993316

Tags: Missing persons; Shooters of firearms; Wisconsin; Counterfeits and counterfeiting; Frontier and pioneer life; Sisters