Yuugo Aosaki is a Japanese mystery writer. He debuted in 2012 with The Gymnasium Murder, which won the 22nd Tetsuya Ayukawa Award and earned him the title “the Ellery Queen of the Heisei Era.” As implied, his work takes its cue from Queen, featuring elaborate logical deductions from minor evidence. However, his only work that’s made it to the west is the anime adaptation of his Undead Girl Murder Farce novels.
However, thanks to Alex of The Detection Collection, I’ve been able to read one of his short stories: “Knockin’ on Locked Door,” original published in Dokuraku magazine in 2014, then published in the collection of the same name in 2016. Does it live up to the hype I’ve seen?
“Knockin’ on Locked Door” is the first entry in the Knockin’ On Locked Door series, staring the Knockin’ on Locked Door Detective Agency. The agency is comprised of Tori Gotenba, who specializes in impossible crimes, and narrator Hisami Katanashi, who specializes in “why” problems. The central idea of the series is that each story is a competition between the two men to see who will solve the case first. But the case they have here will require both their skills.
The victim is Hideo Kasumiga, a well-known painter. He was found stabbed to death in his studio one morning by his son and by one of his admirers. The door was firmly locked on the inside by a rusty lock; it can be opened from the outside, but not locked. This seems like a perfect fit for Tori, but there are some odd questions that need to be answered. First, why did the culprit vandalize one of Hideo’s works of art by painting it fully red? And why did the killer even create a locked room in the first place? There was no effort to disguise it as a suicide or accident, and the dead man wasn’t even in the habit of locking his door anyway. Hisami remains in the background for much of the story before coming in at the eleventh hour to snatch the last word from Tori.
This is a really solid story. The banter between our heroes as well as the police officer on scene, a former classmate, is amusing. And the locked room is no slouch either. There are only three suspects and none of them have much page time, so the locked room is the main focus. And it’s well-clued! A careful reader can notice the key clue that puts Tori onto the murderer, and by thinking more about what that clue implies, the reader can make a genuine attempt at seeing how the crime was done. And it’s a really creative solution. It’s not wild or improbable, just unconventional. But what elevates the story is the “why” part. I doubt that anyone would figure this out without some knowledge of a historical fact (or at least an educated guess), but it’s a really good motive and does an excellent job of justifying why there’s a locked room in the first place.
I first read this story for Alex’s New Locked Room Library. I’d binged a lot of locked rooms for that project, and when I got to this one, I was getting burned out. I’d read a lot, seen a lot of locked rooms, and was getting tired of the whole thing. There was no creativity, just the same basic solutions repackaged. And while you can argue that this is more of the same, there’s enough creativity on display in method and motive to elevate it. It’s fair to say that this story reminded me why I love locked rooms.
Obviously, this story comes Highly Recommended, and I hope to see more Aosaki in translation.
Other Reviews: The Case Files of Ho-Ling (review of entire collection), Bad Player's Good Reviews (ditto), Beneath the Stains of Time.





