| Title | Published |
|---|
| The Mystery of the Burnt Cottage | 1943 |
| The Mystery of the Disappearing Cat | 1944 |
| The Mystery of the Secret Room | 1945 |
| The Mystery of the Spiteful Letters | 1946 |
| The Mystery of the Missing Necklace | 1947 |
| The Mystery of the Hidden House | 1948 |
| The Mystery of the Pantomime Cat | 1949 |
| The Mystery of the Invisible Thief | 1950 |
| The Mystery of the Vanished Prince | 1951 |
| The Mystery of the Strange Bundle | 1952 |
| The Mystery of Holly Lane | 1953 |
| The Mystery of Tally-Ho Cottage | 1954 |
| The Mystery of the Missing Man | 1956 |
| The Mystery of the Strange Messages | 1957 |
| The Mystery of Banshee Towers | 1961 |