* The Green Child (1934)
* The Lost Land (1936)
* The Bird in the Tree (1937)
* The Pendulum (1938)
* The Experiment (1939)
* The Island (1940)
* The Wall (1941)
* The Door (1942)
* The Window (1943)
* The Mirror (1944)
* The Cage (1945)
* The Key (1946)
* The Lock (1947)
* The Chain (1948)
* The Ring (1949)
* The Bell (1950)
* The Book (1951)
* The Candle (1952)
* The Fire (1953)
* The Water (1954)
* The Earth (1955)
* The Air (1956)
* The Light (1957)
* The Dark (1958)
* The Good (1959)
* The Evil (1960)
Short Stories:
* The Green Child (1934)
* The Lost Land (1936)
* The Bird in the Tree (1937)
* The Pendulum (1938)
* The Experiment (1939)
* The Island (1940)
* The Wall (1941)
* The Door (1942)
* The Window (1943)
* The Mirror (1944)
* The Cage (1945)
* The Key (1946)
* The Lock (1947)
* The Chain (1948)
* The Ring (1949)
* The Bell (1950)
* The Book (1951)
* The Candle (1952)
* The Fire (1953)
* The Water (1954)
* The Earth (1955)
* The Air (1956)
* The Light (1957)
* The Dark (1958)
* The Good (1959)
* The Evil (1960)