| Publishing info incomplete. Tempo
    changed the series order, apparently. | 
    THE CLUE IN BLUE -- 1948. Grosset & Dunlap.
 
THE RIDDLE IN RED -- 1948. Grosset & Dunlap.
 
PUZZLE IN PURPLE -- 1948. Grosset & Dunlap. 
 
? SECRET OF BLACK CAT GULCH -- 1948, Grosset & Dunlap; 1965,
      Tempo.
 
THE GREEN ISLAND MYSTERY -- 1949, Grosset & Dunlap; 1966,
      Tempo.
 
THE GHOST WORE WHITE -- 1950. Grosset & Dunlap.
 
THE YELLOW WARNING -- 1951. Grosset & Dunlap.
 
THE GRAY MENACE -- 1953. Grosset & Dunlap.
 
THE BROWN SATCHEL MYSTERY -- 1954, Grosset & Dunlap; 1966,
      Tempo (#2 in Tempo numbering)
 
PERIL IN PINK -- 1955. Grosset & Dunlap.
 
THE SILVER SECRET -- 1956. Grosset & Dunlap.
 
THE MYSTERY OF THE RUBY QUEENS -- "Connie Blair's
      irrepressible curiosity leads to the discovery of hidden rooms, family
      secrets, and missing heirlooms in an old mansion." -- 1958,
      Grosset & Dunlap. 1966, Tempo (#1 in Tempo numbering) |