The Tragedy of Y

York Hatter had been missing for some time and is eventually found after apparently having jumped from a ferry and poisoning himself before that to commit suicide. Afterwards follow two attempts to poison his deaf, blind and mute step-daughter Louisa Campion. In the second case, her mother Emily Hatter, who is sleeping in the same room, is knocked down with York's old mandolin and dies from shock. The rest of the case isn't any less abnormal than the Hatter family itself and to make sense of the happenings, Inspector Thumm needs the help of Drury Lane.

木製の王子

World-famous painter and sculptor Shirakashi Munenao and his family finally appear in the media after Munenao began accepting interviews and building their strange mansion in the depth of Kyouto's Mt. Hiei. The Shirakashi were mostly living in secrecy before and their inbred family tree draws the public attention. When journalists Kisaragi Uyuu and Anjou Norisada visit their mansion for an article about Munenao's new painting, Shirakashi Akika's severed head is found on her piano. Due to unbroken snow surrounding the mansion, only one of its inhabitants could be the murderer. However, due to huge digital clocks in every room making their movements perfectly rememberable, all of them possess alibis for the hour in which the murder must have been committed!

金雀枝荘の殺人

Tamiya Yasaburou brought his german wife Elisabeth over to Japan during the Meiji period and built a whole mansion for her. Their shared happiness did not last long though and she left him and their daughter returning to her homeland. Ever since the mansion has become a baneful stage for 2 murders with numerous victims.

1990: One year after 5 of their siblings/cousins and the mansion's caretaker were found dead after they seemingly killed each other while all of the mansion's exits were locked, Tamiya Anna, Rui, Otohiko, Touma and 2 uninvited guests meet at the crime scene to figure out what tragedy actually brought forth this strange incident.

霧越邸殺人事件

On a late autumn day dramaturge Yarinaka Akisaya, his 7 actors and his friend, the novelist Rindou Ryouichi, have to take shelter from a snow storm in a western mansion that suddenly appears from the depth of mist that ascends from a lake. They don't seem to be welcomed by the inhabitants but each get their own room designated. Even so they are continuously reminded by the servants that Kirigoe Mansion is not a hotel and that they shall not sneak about too much, especially they shall not enter the 3rd floor at all...

In this ominous mansion strange coincidences happen and the building itself is said to be a mirror that reflects the future of those who visit it. Little would the guests be able to guess how these occurences lead to a chain of murders after the mansion and its surrounding are totally covered by snow without any way to inform the outer world...

人形館の殺人

Hiryuu Souichi moves into the mansion his father left behind after his suicide. The several mannequins standing around there count to the lesser mysteries Souchi encounters in his new environment. Strange sounds at night, threatening letters and the staring gazes from the neighbourhood and eventually a murder incident drive Souchi into calling Shimada Kiyoshi, an old friend of his to make sense of the strange happenings that begin to entangle him.

夏と冬の奏鳴曲(ソナタ)

To celebrate the 20th anniversary of their idol Mamiya Kazune, a group of people in their forties gather on Kazune Island where they once spend a year together worshipping her. Looking back on their young days they are accompanied by Kisaragi Uyuu and his assistant Maina Touri, who are supposed to interview them and write an article about their reunion. Eventually a decapitated corpse turns up... on a snowy morning in August.

螢

Six members of an occult spot exploration circle plan on staying in the Firefly Mansion located in the thicket of Kyouto's mountain ranges. One of the circle's prospering old boys bought this mansion known for becoming a crime scene ten years ago when a famous composer, the former owner of the mansion, murdered his six performing musicians in one night. What was supposed to be a mere test of courage and an otherwise relaxed camping among the circle members quickly turns into another murder incident.

『ギロチン城』殺人事件

Self-proclaimed detective Makube Nako finds a doll disposed on 'doll mound' that writes the message "Help" with a photo attached, that shows a girl standing in front of a guillotine. This indirect client leads Nako and his friend Yorishina Yuuki to the legendary Guillotine Castle, a place that stores numerous execution tools and is equipped with an excessive security system. One year ago, the castle's lord was found decapitated in a locked room situation with a decapitated Russian doll beside him. After Nako and his companion arrive, Guillotine Castle welcomes them with another locked room murder...

迷路館の殺人

Prominent mystery writer Miyagaki Youtarou invites his 4 disciples, a literary critic, an editor and his wife and mystery maniac Shimada Kiyoshi to his underground labyrinth mansion. However he is found dead when they arrive and a tape tells his disciples of his wish to improve their skills under the condition of being locked into this closed circle situation and write themselves into their works using his mansion as location. Their works are to be evaluated by the critic and the editor and the winner is going to inherit Miyagaki's entire fortune. The authors begin to write their individual stories and it does not take long until murders happen according to those scripts.

This incident became fairly known afterwards and one year later a literary reconstruction published by Kitansha Novels arrives at Shimada's. It was written under the pen name Shishiya Kadomi, who claims to have been involved in the case, which Shimada acknowledges before he delves into the book...

笑わない数学者

Saikawa and Moe are invited to legendary mathematician Tennouji Shouzou's Christmas party in his mansion Mitsuboshikan. While the guests are in the mansion's planetarium, the huge Orion statue in front of the mansion vanishes and the professor challenges his guests to solve this mystery. When the statue appears again later, the corpse of a guest who was supposed to have been in her room is found in front of it, while another corpse turns up in her room...

翼ある闇 メルカトル鮎最後の事件

When the detective Kisarazu Yuuya and his companion and mystery writer Kouzuki Sanetomo arrive at the medieval-ish mansion Souajou, Kisarazu's client has already been killed, just as this client's son, with their heads being cut off and swapped with one body and head found in a locked room. For what sake do the serial murders in the Imakagami family continue? Why all the incomprehensible staging of the murders? And why was Kisarazu hired in the first place?

水車館の殺人

The odd-looking 'water wheel mansion' inhabited by a masked host and a lonely young woman... Last year in a stormy night it was haunted by an unfathomable tragedy. Will the nightmare occur this year again? The secret of Fujinuma Issei's posthumous visionary painting and the mysterious disappearance of Shimada Kiyoshi's friend from a locked room guides Shimada to the mansion to uncover the secret truth hidden behind the steadily turning water wheels...

『クロック城』殺人事件

In 1994 a sunspot 30 times as huge as the earth was discovered and by its influence the planet has been in disorder since then. The world is said to meet its demise in 1999. It is in that year, that a certain request for detective Minami Miki drops in. He proceeds to Clock Castle, whose outer wall is furnished with 3 huge clocks which display past, present and future, and whose interior is divided into 3 separate mansions as well. The proprietor's daughter, Kurou Ruka, is said to be Midnight's Key, a crucial being in earth's final moment. She asks Miki to investigate the eerie face staring out of the cellar's wall. Ruka suspects a ghost called Skipman, which rumor has been passed on in the mansion for generations. This Skipman is supposed to be able to rip a hole into time and travel into the past and future. Soon after Miki begins his investigations, a seemingly impossible murder resembling the legend of Skipman ensues...

十角館の殺人

Tsunojima, Aoyashiki's burnt down remains and a decagon-shaped guesthouse. The latter is used by seven students from a university's mystery club and as someone would naturally expect considering this setting, serial murders start happening on this otherwise uninhabited island with no one willing to confess the crimes. Two other students who did not visit the island with their fellow students receive mysterious letters from Nakamura Seji, the proprietor of former Aoyashiki and the whole island, who supposedly died in the incident in the mansion half a year ago. They find out that those letters were also sent to their meanwhile absent fellow students and they begin investigating the incident of Tsunojima's past...

鏡の中は日曜日

1987 a murder happened in the property of the Mallarmé-fascinated retired professor Zuimon Ryuuhshirou. At that time among others the great detective Mizuki Masaomi and his assistant Ayui Ikusuke were guests of Zuimon. Of course Mizuki solved the case brilliantly and Ayui created a new novel in his series depiciting Mizukis astonishing achievements. However this work was never collected as a tankoubon volume and remained unfinished in magazine form...

2001 the self-proclaimed great detective Isurugi Gisaku is called on by the editor of a publishing company. He wants to have the case investigated once more, finding it suspicious that this work has not been finished in 14 years. Might there actually be a mistake in Mizuki's deduction...?