Novels
Blue Treasure (1937)
Phantom On Skis (1939)
The White Tulip (1944)
The Light in the Mill (1946)
The Seventh Step (1949)
Hidden Pond (1951)
End of a Golden String (1952)
Patty and the Spoonbill (1953)
The Clue in the Antique Clock (1957)
Disappearance At Lake House (1959)
Mystery of the Unwelcome Visitor (1959)
The Frightened Whisper (1963)
The Missing Masterpiece (1965)
The Hidden Treasure (1968)
Shadow in the Greenhouse (1970)
Phantom On Skis (1939)
The White Tulip (1944)
The Light in the Mill (1946)
The Seventh Step (1949)
Hidden Pond (1951)
End of a Golden String (1952)
Patty and the Spoonbill (1953)
The Clue in the Antique Clock (1957)
Disappearance At Lake House (1959)
Mystery of the Unwelcome Visitor (1959)
The Frightened Whisper (1963)
The Missing Masterpiece (1965)
The Hidden Treasure (1968)
Shadow in the Greenhouse (1970)
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