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The development team of the jellyfish ship, a small spacecraft manufactured by relying on new technologies that "changed the history of human aviation", is conducting flight tests of new models. An accident occurred unexpectedly, and the jellyfish boat crashed into the snowy mountain. In the bad weather, team members waiting for rescue were killed one after another. With nowhere to escape and no survivors, where is the real murderer? The informal police officer Maria and her subordinate Ren Kujo launched an investigation, but encountered interference and obstruction from the military along the way. The shady research on jellyfish boats actually involves a key figure hidden behind the technological revolution...

Boneyard, where the U. S. Air Force parks retired military aircraft. Expensive military aircraft cannot be hastily dismantled into scrap metal. Sometimes they have to be put back into service after repairs. In other cases, parts need to be removed and used to repair other aircraft like organ transplants. A soldier on patrol at night discovered the body of his companion, which triggered the undercurrent surging within the army. Major Nissen turns to the police officers Maria and Kujo Ren who met because of the jellyfish boat case, hoping that they can find out the truth... Secret illegal transactions, strange footprints in the snow, far away confidants, disappeared seekers... The "red-haired devil" Maria and the black-haired detective Ren Kujo challenge four strange cases one after another!

Vampire Dog, a serial killer who was arrested more than 20 years ago. Although he was officially sentenced to life in prison, he was actually secretly imprisoned in a research institution for an experiment unknown to the world. A group of desperadoes successfully robbed a cash transport truck. On their way to escape, they were rounded up by the police and forced to hide in an uninhabited mansion. Maria and Ren Kujo joined the police search operation, but when they entered the robber's hideout, they found multiple dead bodies. The corpses were in the same tragic condition as the victims in the "Vampire Dog" case... Winner of the 26th Ayukawa Tetsuya Award - Ichikawa Yuhito's work, a new novel in the "Red-Haired Detective & Black-Haired Detective" series. It is a masterpiece that breaks through the double evil of closed space and latent time limit, and combines classical reasoning style with special setting system.