The Secret of Chimneys / The Unpleasentness at the Bellona Club

The 5th in July!
Our books for July are:
The Secret of Chimneys
by Agatha Christie - her 5th novel published 1925
and/or
The Unpleasantness at the Bellona Club
by Dorothy L. Sayers - her 5th novel published 1928
and/or
Our wild card for this month is:
Scandalize My Name
by Fiona Sinclair - published 1960