A young Amish boy named Samuel witnesses a brutal murder in the restroom of a Philadelphia train station while traveling with his mother, Rachel. The case falls under the jurisdiction of John Book, a seasoned and tough city detective. Despite the culture shock, Samuel is able to identify a photograph of the killer, McFee, from among Book's collection of mugshots. But this case isn't a simple one; it unfolds into a conspiracy that reaches deep into the police department. When Book realizes that he and Samuel have become targets after he confronts the corrupt police officers involved, he takes drastic measures to ensure their safety.

Book retreats to the Amish countryside with Samuel and Rachel, integrating himself into their peaceful, technology-free community to hide from the corrupt cops who are determined to silence them. As he immerses himself in Amish life, he develops a deep respect for their simple living and begins to form a close bond with Samuel and Rachel. This unexpected cultural exchange is fraught with challenges, both from Book's difficulty in adjusting to Amish ways and the growing attraction between him and Rachel, which goes against the customs of her people. The tranquility of the Amish world contrasts sharply with the violence Book is trying to escape, creating a poignant juxtaposition and setting the stage for the collision of two vastly different worlds.