- The Mystery of the Burnt Cottage 1943The Mystery of the Burnt Cottage
- The Mystery of the Disappearing Cat 1944The Mystery of the Disappearing Cat
- The Mystery of Holly Lane 1953The Mystery of Holly Lane
- The Mystery of the Missing Man 1956The Mystery of the Missing Man
- The Mystery of the Strange Messages 1957The Mystery of the Strange Messages
- The Mystery of Banshee Towers 1961The Mystery of Banshee Towers
Series