* "Mannen från molnen" (1937)
* "Death in Air" (1938)
* "Flying Colors" (1940)
* "Dubbelexponering" (1941)
* "Den gula halsduken" (1942)
* "The White Rose of Athens" (1943)
* "Den svarta döden" (1944)
* "The Scarlet Angel" (1945)
* "Den gröna masken" (1946)
* "Det blå tåget" (1947)
* "The Purple Cloud" (1948)
* "Den röda döden" (1949)
* "The Brown Veil" (1950)
* "The Grey Mist" (1951)
* "The Pale Tiger" (1952)
* "The Dark Room" (1953)
* "Silverdolken" (1954)
* "The Golden Snake" (1955)
* "The Ivory Madonna" (1956)
* "Jaderingen" (1957)
* "The Scarlet Feather" (1958)
* "The Azure Flame" (1959)
* "The Emerald Chalice" (1960)
* "The Amber Amulet" (1961)
* "The Ruby Key" (1962)
* "Pärlarmbandet" (1963)
* "The Silver Skull" (1964)
* "Den gyllene dolken" (1965)
* "The Ivory Idol" (1966)
* "Jademasken" (1967)
* "The Scarlet Claw" (1968)
* "Den blå diamanten" (1969)
* "The Green Tiger" (1970)
* "The Purple Heart" (1971)
* "Den bruna pantern" (1972)
* "The Grey Falcon" (1973)
* "The Pale Panther" (1974)
* "The Pale Fox" (1975)
* "Guldvargen" (1976)
* "Elfenbensugglan" (1977)
* "The Jade Tiger" (1978)
* "Den röda döden" (1979)
* "The Red Tiger" (1980)
* "Den röda rosen" (1981)
* "The Red Fox" (1982)
* "Den röda falken" (1983)
* "Den röda vargen" (1984)
* "Den röda pantern" (1985)
* "Den röda ugglan" (1986)
* "The Red Snake" (1987)
* "Den röda duvan" (1988)
* "Det röda lejonet" (1989)
* "The Red Eagle" (1990)
* "Den röda hästen" (1991)
* "The Red Bear" (1992)
* "Den röda draken" (1993)
* "The Red Phoenix" (1994)
* "Den röda enhörningen" (1995)
* "The Red Griffin" (1996)
* "Den röda sfinxen" (1997)
* "The Red Octopus" (1998)
* "The Red Crab" (1999)
* "The Red Shark" (2000)
* "The Red Scorpion" (2001)
* "Den röda spindeln" (2002)
* "The Red Beetle" (2003)
* "The Red Centipede" (2004)
* "The Red Ant" (2005)
* "Den röda getingen" (2006)
* "Det röda biet" (2007)
* "Den röda fjärilen" (2008)
* "The Red Moth" (2009)
* "The Red Scarab" (2010)
Facklitteratur:
* "Spionen bakom linjerna" (1939)
* "Den stora spionmyten" (1940)
* "Europas hemliga tjänster" (1941)
* "Spionen från Mars" (1942)
* "Spionen i nästa rum" (1943)
* "Kriget bakom fronten" (1944)
* "Hemligheten bakom Hitlers krig" (1945)
* "The Battle of the Brains" (1946)
* "Det osynliga kriget" (1947)
* "Det stora spionäventyret" (1948)
* "The Master Spy" (1949)
* "The Spycatcher" (1950)
* "The Spy Network" (1951)
* "The Spy Trap" (1952)
* "The Spy Killer" (1953)
* "The Spy Hunter" (1954)
* "The Spy Chaser" (1955)
* "The Spy Catcher" (1956)
* "The Spy Smasher" (1957)
* "The Spy Breaker" (1958)
* "The Spy Tamer" (1959)
* "The Spy Defier" (1960)
* "The Spy Challenger" (1961)
* "The Spy Traitor" (1962)
* "The Spy Vanisher" (1963)
* "The Spy Assassin" (1964)
* "The Spy Saboteur" (1965)
* "The Spy Destroyer" (1966)
* "The Spy Dictator" (1967)
* "The Spy Conqueror" (1968)
* "The Spy Eliminator" (1969)
* "The Spy Annihilator" (1970)
* "The Spy Exterminator" (1971)
* "The Spy Decimator" (1972)
* "The Spy Vanquisher" (1973)
* "The Spy Obliterator" (1974)
* "The Spy Destroyer" (1975)
* "The Spy Eliminator" (1976)
* "The Spy Annihilator" (1977)
* "The Spy Exterminator" (1978)
* "The Spy Decimator" (1979)
* "The Spy Vanquisher" (1980)
* "The Spy Obliterator" (1981)
* "The Spy Destroyer" (1982)
* "The Spy Eliminator" (1983)
* "The Spy Annihilator" (1984)
* "The Spy Exterminator" (1985)
* "The Spy Decimator" (1986)
* "The Spy Vanquisher" (1987)
* "The Spy Obliterator" (1988)
* "The Spy Destroyer" (1989)
* "The Spy Eliminator" (1990)
* "The Spy Annihilator" (1991)
* "The Spy Exterminator" (1992)
* "The Spy Decimator" (1993)
* "The Spy Vanquisher" (1994)
* "The Spy Obliterator" (1995)
* "The Spy Destroyer" (1996)
* "The Spy Eliminator" (1997)
* "The Spy Annihilator" (1998)
* "The Spy Exterminator" (1999)
* "The Spy Decimator" (2000)
* "The Spy Vanquisher" (2001)
* "The Spy Obliterator" (2002)
* "The Spy Destroyer" (2003)
* "The Spy Eliminator" (2004)
* "The Spy Annihilator" (2005)
* "The Spy Exterminator" (2006)
* "The Spy Decimator" (2007)
* "The Spy Vanquisher" (2008)
* "The Spy Obliterator" (2009)
* "The Spy Destroyer" (2010)