Baron
1. Meet the Baron (1937)
     aka The Man in the Blue Mask
2. The Baron Returns (1937)
     aka The Return of Blue Mask
3. The Baron Again (1938)
     aka Salute Blue Mask
4. The Baron at Bay (1938)
     aka Blue Mask at Bay
5. Alias the Baron (1939)
     aka Alias Blue Mask
6. The Baron at Large (1939)
     aka Challenge Blue Mask!
7. Versus the Baron (1940)
     aka Blue Mask Strikes Again
8. Call for the Baron (1940)
     aka Blue Mask Victorious
9. The Baron Comes Back (1943)
10. A Case for the Baron (1945)
11. Reward for the Baron (1945)
12. Career for the Baron (1946)
13. The Baron and the Beggar (1947)
14. Blame the Baron (1948)
15. A Rope for the Baron (1948)
16. Books for the Baron (1949)
17. Cry for the Baron (1950)
18. Trap the Baron (1950)
19. Attack the Baron (1951)
20. Shadow the Baron (1951)
21. Warn the Baron (1952)
22. The Baron Goes East (1953)
23. The Baron in France (1953)
24. Danger for the Baron (1953)
25. The Baron Goes Fast (1954)
26. Nest-Egg for the Baron (1954)
     aka Deaf, Dumb and Blonde
27. Help from the Baron (1955)
28. Hide the Baron (1956)
29. Frame the Baron (1957)
     aka The Double Frame
30. Red Eye for the Baron (1958)
     aka Blood Red
31. Black for the Baron (1959)
     aka If Anything Happens to Hester
32. Salute for the Baron (1960)
33. A Branch for the Baron (1961)
     aka The Baron Branches Out
34. Bad for the Baron (1962)
     aka The Baron and the Stolen Legacy
35. A Sword for the Baron (1963)
     aka The Baron and the Mogul Swords
36. The Baron on Board (1964)
37. The Baron and the Chinese Puzzle (1964)
38. Sport for the Baron (1966)
39. Affair for the Baron (1967)
40. The Baron and the Missing Old Masters (1968)
41. The Baron and the Unfinished Portrait (1969)
42. Last Laugh for the Baron (1970)
43. The Baron Goes A-Buying (1971)
44. The Baron and the Arrogant Artist (1972)
45. Burgle the Baron (1973)
46. The Baron - King Maker (1975)
47. Love for the Baron (1979)