- The Adventures of Jacky Raccoon (1921)
- Mysteriet med den gamle mølle (1923)
- Hemmeligheden bag det gamle ur (1924)
- The Ghost in the Garret (1925)
- The Clue in the Crumbling Wall (1927)
- The Invisible Intruder (1928)
- The Phantom of the Pool (1929)
- Gåden om den røde rose (1930)
- The Tragedy of the Twin Towers (1931)
- Mysteriet om den stønnende hule (1933)
- The Secret of the Singing Sword (1935)
- The Ghost in the Grey Suit (1937)
- Clue of the Crimson Key (1941)
- The Riddle of the Raven's Skull (1943)
- Mysteriet om det skjulte rum (1946)
- Skeletnøglens hemmelighed (1950)