A blizzard is coming, and a murderer known as the Mockingbird stalks the snow.

Seven teenagers went into the mountains on a camping trip. Two days later, their parents lost contact.

And now a young woman's body is found tied to a tree. The campsite was destroyed, and the others are all missing. But rumors abound, and a folktale resurrects—legends say there's a wildman in the mountains known as the Mockingbird who mimics the voices of those he kills.

In the small, gold-mining town of Nome, FBI Agent Ella Porter is called in to hunt the killer in the mountains and to discover what happened to the other campers.

Meanwhile, Ella's father wants revenge against his daughter, and a serial killer from Ella's past—the man who cost her everything—is on his way to Nome.