The Outlaw's Letter

Grant Davis is searching for the man to clear his name, after having spent time in prison, thanks to his mother, for a crime he did not commit. He is given a letter by Harriet 'Hetty' Osgood from his brother, but before he get a chance to respond, Hetty takes off with a criminal from her past chasing her.
Harriet Osgood, is a teacher in Kiowa Well, Colorado when a wounded young man falls through her schoolroom door. He hands her a letter and the words ' brother, give him, Bucket of Blood, Pueblo' before he passes out. Hetty dresses as a boy to deliver the letter herself, but soon finds that the short adventure and good deed end up being much more than she expected.
Can Hetty and Grant find happiness, despite the forces of their past doing everything to destroy their very lives? Is 'The Outlaw's Letter' the key?