The Stolen

The Stolen - Official Trailer
YouTube blurb:

In 1860, Charlotte Lockton has settled in the South Island of New Zealand with her wealthy husband, David. But her life’s dreams are shattered when he’s murdered on their farm and her baby son is kidnapped. A month after paying a ransom, frustrated with the apathy of the authorities and distrusting of her staff, she decides to track him down on her own. And so begins her journey through the wild untamed New Zealand, at the beginning of the Gold Rush.

She joins a convoy of whores, ex-cons and a Maori warrior heading for the rough mining community of Gold Town. There she meets Joshua McCullen, the owner of the town, a man who is key to uncovering the truth behind the disappearance of her son, forcing her to fight to the death for what she holds most dear.

Charlotte is unbelievably naive, or unbelievably sheltered. Here she is half around the world from home and seems to be totally lacking in any common sense. However, she can play the piano, not that it does her much good. Whatever. The man behind the crimes (robbery, murder, kidnapping) is fully engaged in building a town at the site of the latest gold rush, but he takes the time to travel two weeks overland to commit this outrage, and then travels two weeks back. He must have been plotting vengeance for a very long time, but we are given only a vague explanation.

Not too awful. We do have a plausibly authentic gold rush town, and at least one big gunfight, so it wasn't a complete loss.