When two Irish tourists vanish in New Zealand, Dublin Special Branch detective Theo Richter travels there to help with the search. Teaming up with Diana Huia, a recently promoted local detective, he tries to gain the community's trust and find the couple before it's too late. But the picturesque rural town of Mount Affinity hides a dark history of disappearances and death.

Widowed English nurse Joan Kirkhope (Greta Scacchi) is on a quest to find answers about her husband's mysterious death, while ex-detective Jack Darby (Bryan Brown) has taken to the open road to escape his past. But when they collide in the Australian outback and become drawn into a series of mysteries, this unlikely investigative duo soon realize the most intriguing puzzle they face is each other.