Murdered: One By One by Francis Beeding (Popular Library, 1944)
Lydian in roman and italic caps (1938/1939), on the cover of a novel by Francis Beeding, published as a Popular Library Mystery in 1943 or 1944. Beeding is a collaborative pseudonym used by English authors Hilary Saint George Saunders and John Palmer. The cover art is by H. Lawrence Hoffman. From Goodreads:
Detective Inspector Martin of Scotland Yard exposes a clever madman who strikes at the members of a literary society in a small English town.
