Lida aka The Foolish Frail
Written by
Leslie Charteris
Copyright 1948
Published as The Quarterdeck Club in 2 issues of Ellery Queen's Mystery Magazine (US - Aug. 1947 & AUS - Jan. 1950), Suspense (UK - Jan. 1959), plus
as The Foolish Frail in The Saint Mystery Magazine (UK - Mar. 1963) and as Lida in the anthology titled Giant Mystery Reader (Avon - 1951). Also published
in the collection .
When Joan asks Templar for help freeing her sister from a blackmailer, they discover the sibling has been murdered.