The Vintage Mystery Reading Challenge is hosted by My Reader's Block. The goal is to read mysteries written before 1960. I signed up at the "In a Murderous Mood" level with the goal of reading four to six books, by at least two different authors, by the end of the year.
Clouds of Witness by Dorothy L. Sayers
The Sign of the Four by Sir Arthur Conan Doyle
The League of Frightened Men by Rex Stout
A Study in Scarlet by Sir Arthur Conan Doyle (not reviewed yet)