The Mystery of the Galloping Ghost

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Books in series order

1.   The Secret of the Mansion  (1948)
2.   The Red Trailer Mystery  (1950)
3.   The Gatehouse Mystery  (1951)
4.   The Mysterious Visitor  (1951)
5.   The Mystery Off Glen Road  (1956)
6.   Mystery in Arizona  (1958)
7.   The Mysterious Code  (1961)
8.   The Black Jacket Mystery  (1961)
9.   The Happy Valley Mystery  (1962)
10.   The Marshland Mystery  (1962)
11.   The Mystery at Bob-White Cave  (1962)
12.   The Mystery of the Blinking Eye  (1963)
13.   The Mystery on Cobbett's Island  (1964)
14.   The Mystery of the Emeralds  (1965)
15.   Mystery on the Mississippi  (1965)
16.   The Mystery of the Missing Heiress  (1977)
17.   The Mystery of the Uninvited Guest  (1977)
18.   The Mystery of Phantom Grasshopper  (1977)
19.   The Secret of the Unseen Treasure  (1978)
20.   The Mystery Off Old Telegraph Road  (1978)
21.   The Mystery of the Castaway Children  (1979)
22.   The Mystery at Mead's Mountain  (1978)
23.   The Mystery of the Queen's Necklace  (1979)
24.   The Mystery at Saratoga  (1979)
25.   The Sasquatch Mystery  (1979)
26.   The Mystery of the Headless Horseman  (1979)
27.   The Mystery of the Ghostly Galleon  (1979)
28.   The Hudson River Mystery  (1979)
29.   The Mystery of the Velvet Gown  (1980)
30.   The Mystery of the Midnight Marauder  (1980)
31.   The Mystery at Maypenny's  (1980)
32.   The Mystery of the Whispering Witch  (1980)
33.   The Mystery of the Vanishing Victim  (1980)
34.   The Mystery of the Missing Millionaire  (1980)
35.   The Mystery of the Memorial Day Fire  (1984)
36.   The Mystery of the Antique Doll  (1984)
37.   The Pet Show Mystery  (1985)
38.   The Indian Burial Ground Mystery  (1985)
39.   The Mystery of the Galloping Ghost  (1986)