一、事件的舞台必須是封閉空間，例如孤島或暴風雪山莊。登場人物無法自由出入，也必須排除擁有先進鑑識技術的警方。亦即，必須保證只有邏輯思考才能破案的必然性。 二、屋內的各房間都要能夠上鎖，屬於重視隱私的建築物。 三、屋宅的主人或客人，全員在小說開頭都必須介紹給讀者，兇手就在其中。 四、發生了各種事件，並導向血腥的慘劇。 五、偵探登場，是後來才出場，或是一開始就在屋內都可以。
- 3月 02 週日 200813:13
新本格七則 (by島田莊司)
- 3月 02 週日 200802:05
推理小說二十則 Twenty Rules for writing Detective Novels (by S.S. Van Dine)
1. 推理小說必須給讀者與偵探同等的機會去推理，解決謎團。因此所有的線索要寫清楚。
The reader must have equal opportunity with the detective for solving the mystery. All clues must be plainly stated and described.
2. 除兇手對偵探佈置的謎團之外，作者不可另外以文字描述向讀者佈置詭計，使讀者發生混亂。
No willful tricks or deceptions may be placed on the reader other than those played legitimately by the criminal on the detective himself.
3. 推理小說不可加入戀愛故事，因為這容易使純粹的鬥智遊戲，滲透不純粹的情緒，以致引起推理的混亂。推理小說的主旨在於尋出真兇，而不在談情說愛。
The reader must have equal opportunity with the detective for solving the mystery. All clues must be plainly stated and described.
2. 除兇手對偵探佈置的謎團之外，作者不可另外以文字描述向讀者佈置詭計，使讀者發生混亂。
No willful tricks or deceptions may be placed on the reader other than those played legitimately by the criminal on the detective himself.
3. 推理小說不可加入戀愛故事，因為這容易使純粹的鬥智遊戲，滲透不純粹的情緒，以致引起推理的混亂。推理小說的主旨在於尋出真兇，而不在談情說愛。
- 3月 02 週日 200801:43
推理小說十誡 Ten Commandment list for Detective Novelists (by Ronald Knox)
1. 犯人一定要是在故事發生之初登場的人物
The criminal must be someone mentioned in the early part of the story, but must not be anyone whose thoughts the reader has been allowed to follow.
2. 偵探不能運用超自然的能力來解決事件
All supernatural or preternatural agencies are ruled out as a matter of course.
The criminal must be someone mentioned in the early part of the story, but must not be anyone whose thoughts the reader has been allowed to follow.
2. 偵探不能運用超自然的能力來解決事件
All supernatural or preternatural agencies are ruled out as a matter of course.
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