The #TBR tin has spoken.
Next read for fiction:
Great tales of detection has 19 short stories selected and introduced by Dorothy L. Sayers. This collection was originally published in 1936, but it's still easy to find this more "recent" edition from Everyman.
Sayers edited several short stories collections and besides the interesting stories, she also wrote insightful introductions about the history and development of the genre.
I'll be using an Oxford related bookmark.
Next read for non-fiction:
Howdunit is a collection of essays about the genre and the work of detective, crime, thrillers authors. The articles are all from the past and present members of The Detection Club, organised and edited by Martin Edwards.
Bookmark from the Portuguese edition of The Floating Admiral, also a The Detection Club work.