A light novel series written by Sanda Makoto and illustrated by [[Sakamoto Mineji]]. Part of the [[Fate (series)|]] franchise.

This spin-off of the [[fate_(series)|Fate series]] is set between the events of [[Fate/Zero]] and [[Fate/stay night]]. It features the adventures of [[Lord El-Melloi II]] — a 30-something [[Waver Velvet]], now a lecturer at the Magus Association — as he and his 15-year-old assistant/apprentice [[gray (fate)|Gray]] investigate mysteries in the world of Thaumaturgy.

The novels are narrated in a style similar to [[Sherlock Holmes]] detective novels where Gray, much like [[john_hamish_watson|Watson]], serves as the main point-of-view character as she, a neophyte to the affairs of magi, steps into their dangerous society.

A manga adaptation debuted in Young Ace magazine in 2017, and an anime adaptation aired in 2019.

h4. Volumes

* [b]Case1.[/b] Adra Castle Separation.
* [b]Case2.[/b] Twin Form Tower (Upper).
* [b]Case3.[/b] Twin Form Tower (Lower).
* [b]Case4.[/b] Mystic Eyes collection train (Upper).
* [b]Case5.[/b] Mystic Eyes collection train (Lower).

h4. Main Characters

* [[Lord El-Melloi II]]
* [[gray (fate)|Gray]]
* [[Reines El-Melloi Archisorte]]

h4. Secondary Characters

* [[Adashino Hishiri]]
* [[add (fate)|Add]]
* [[Aozaki Touko]]
* [[Caules Forvedge Yggdmillennia]] (Caules Forvedge in this timeline)
* [[hephaestion (fate)|Faker]]
* [[Flat Escardos]]
* [[Luviagelita Edelfelt]]
* [[Olga Marie Animusphere]]
* [[Svin Glascheit]]
* [[Trimmau (fate)|]]
* [[Yvette L. Lehrman]]

h4. External Links

* "Official website":[http://www.typemoon.com/products/tmbooks/elmelloi/index.html]
* "Wikipedia (EN): The Case Files of Lord El-Melloi II":[https://en.wikipedia.org/wiki/The_Case_Files_of_Lord_El-Melloi_II]
* "Wikipedia (JP): ロード・エルメロイII世の事件簿":[https://ja.wikipedia.org/wiki/%E3%83%AD%E3%83%BC%E3%83%89%E3%83%BB%E3%82%A8%E3%83%AB%E3%83%A1%E3%83%AD%E3%82%A4II%E4%B8%96%E3%81%AE%E4%BA%8B%E4%BB%B6%E7%B0%BF]
ロード・エルメロイII世の事件簿 ロードエルメロイII世の事件簿 事件簿アニメ