Kurumi Nanba is a student majoring in math at prestigious university. She's viewed as a weirdo due to her poor communication skills, but having a genius level intellect. Meanwhile, Tatsuhiko Handa is a young detective. Kurumi Nanba and Tatsuhiko Handa work together to solve difficult cases including a series of bomb explosions, a locked-room murder and corporate blackmail.
A hiker is found dead in a remote forest that is popularly known as the "Murder Hole". Opposite the victim is a melting snowman with one eye missing. The start of a series of murders in the forest area near Freudenstadt. The handwriting is always the same: all victims show frostbite, while the left eye is covered with a black gem. The investigative team Maris Bächle and Konrad Diener has Florentin Sneelin in its sights, a reproductive doctor who lives in a romantic moated castle whose ice cellar not only stores champagne. The suspect knew the victims from a stay in a children's home many years ago. The teachers there enforced discipline and order using sometimes sadistic methods. Their wards did the same. There was a strict caste system among the children. Sneelin belonged to the lowest caste. He was a so called "Snow Child", one that his mother wanted "to foist" on his father.
Cláudia Toledo, a former sex symbol and a struggling actress, sees a chance to transform her life when a wealthy businessman proposes to her. What initially seemed like a dream marriage quickly unravels into a deceptive scheme, as Cláudia discovers the union is a sham to maintain appearances. She ends up falling for Tomás, a seductive construction worker, who convinces Cláudia to plot a murder to inherit her husband's fortune.
Mikhail Romanov is a judge in the Primorsky city District court. Romanov is famous for his integrity and integrity: law and justice are above all for him. One day he finds out that his son Anton is in trouble. He took a car without asking and hit a motorcyclist on it, after which he fled the scene of the crime.
Two teenagers secretly meet up in the forest, only to witness a blood bath. They are seen, but escape trying to keep this as a secret, both in fear of the perpetrator and that their secret is revealed.
Until Nair proves his innocence of the accusation against him of killing his wife, he lives on 9th Street to watch the person whom Nair suspects is responsible for his wife's death and the only witness to the killing is a disabled man.