Some basic background on where some of the chief movers and shakers of the Detection Club were in the 1920s (and how those events were going to impact their future lives) to get us started -- I knew the stuff about Dorothy L. Sayers and Agatha Christie, but the chapter on Anthony Berkeley was interesting. Still wondering why Ngaio Marsh never was elected to membership, not even honorary, it appears ... it can't have been her being a native New Zealander; Helen Simpson was Australian by birth (and both she and Marsh lived in England), and John Dickson Carr was American.
I've decided I'm going to count this towards the Free Square of the Detection Club bingo ... what with Eric the Skull making an appearance there, it feels only right. (Besides, it's the logical follow-up to using Edwards's Story of Classic Crime for the center square of the Halloween Bingo.)