Q.B.I.: Queen's Bureau of Investigation by Ellery Queen [1956 PAPERBACK]
FIRST PAPERBACK PRINTING  POCKET BOOKS
Nice reading copy! Some general wear to cover and tanning to pages. Binding is loose on the first few title pages (see last photo)
The Letters Racket--A is for Alfred, who left his poor wife ripe for a blackmailer late in her life. B is for Brothers, three of that name, who skewered one morning the fourth Brother's dame. On through the files of Q.B.I., from Bacon to Kidnap to a Poisoner's try. The victims are many, the killers are, too, and only Ellery Queen can find out who's who!