It's 1885-Luke isn't looking for a wife, and Lizzy doesn't want a husband. So how is it possible they are betrothed?

Johnathan Lucas Walker ?, Luke, to family and friends:

Luke inherits his family's fourth-generation cattle ranch deep in the heart of the Texas panhandle. Duty-bound, he is left to raise his younger brother and sister. A formidable task, given his sister's conniving disposition. Therefore, marriage is the last thing on his mind until he comes face-to-face with an unconventional, breathtakingly beautiful woman dressed only in a shift-the untamable Lizzy Brown. Lizzy intrigues him in a way no other woman has. But with his life already in turmoil, will he rise to the challenge of taming the untamable Lizzy Brown?

Elizabeth Brown, Lizzy, to her family and friends:

Lizzy considers herself progressive. She loves being a woman but dislikes everything about being a genteel southern lady. Rebellious by nature, Lizzy disregards proper etiquette and ignores Charleston's judgmental gentry. To her way of thinking, things need to change, starting with her wearing men's trousers. So when her father announces her betrothal to the handsome overbearing beastly brute, Johnathan Lucas Walker V, she stubbornly resists. She knows nothing about being a wife. She hasn't even been kissed. Will Lizzy submit to her father's wishes or forever be known as the untamable Lizzy Brown?