In self-exile on the remote island of Tasmania, Taylor Bridges is the only Ranger of an isolated National Park, its town slowly drowning beneath the rising waters of the new dam project. Still struggling with the guilt of losing his daughter, Claire, Taylor is a chronic sleepwalker. So, when another little girl goes missing in his park a year to the day of his own child's unsolved disappearance, Taylor's sense of redemption finds him wading in over his head to find her.