The series is adapted from the first two works in the crime novel series "The Murder of Alay" written by Viveca Sten.The story revolves around Stockholm police detective Hanna Ahlander, who chooses to hide in the picturesque Swedish mountain town of Ale in search of breath while facing the stress of her personal and professional life.However, on the day of the bitingly cold St. Lucia's Day, a young woman suddenly disappeared, and Hanna was involuntarily involved in the investigation of the case. At first, local police officer Daniel Lindskog was skeptical about her intervention, but, driven by the situation, had to reluctantly accept her assistance.In the process of pursuing the truth, the two not only had to face the confusing case, but also gradually discovered unexpected understanding and tacit understanding in each other.