The are Japanese mystery novels by Kouhei Kadono. Kadono began his career writing light novels, but this series came from a mainstream publishing label, Kodansha Novels. Del Rey Manga have announced that they will be publishing the first novel in the series in English.
, June, 2000, ISBN 4061821350
- When a dragon is murdered, the main characters must travel the globe, trying to discover how such a thing was even possible. , June, 2001, ISBN 4061821849
- During a sorcery tournament, sorcerers begin dying in unusual ways. , December, 2002, ISBN 4061822829
- A princess is found encased in crystal, and the main suspect flees to an island ruled by pirates , January, 2005, ISBN 406182404X
- In the aftermath of destruction, investigators ponder links between unsolved mysteries from a town's past.