39 books in series

Hardy-guttene

Hardy-guttene is a 39-book series with 39 primary works first released in 1920 with contributions by Franklin W. Dixon, Jerrold Mundis, and Leslie H. Morrill.

#1
The Tower Treasure

1927 • 39 Readers • 214 pages 3.5

#2
The House on the Cliff

1927 • 19 Readers • 138 pages 3.5

#4
The Missing Chums

1928 • 8 Readers • 192 pages 3

#5
Hunting for hidden gold

1920 • 9 Readers • 194 pages 3.7

#11
While the Clock Ticked

1932 • 8 Readers • 174 pages 3.6

#14
The Hidden Harbor Mystery

1935 • 5 Readers 3

#17
The Secret Warning

1938 • 6 Readers • 192 pages 3

#21
The clue of the broken blade

1942 • 5 Readers • 192 pages 3

#22
The flickering torch mystery

1943 • 5 Readers • 160 pages 3.3

#25
The Secret Panel

1946 • 7 Readers • 178 pages 3.3

#28
The sign of the crooked arrow

1949 • 4 Readers • 160 pages 3

#30
The Wailing Siren Mystery

1951 • 4 Readers • 177 pages 3

#33
The Yellow Feather Mystery

1953 • 5 Readers • 181 pages 3

#35
The Secret of Pirates' Hill

1956 • 6 Readers • 178 pages 3.3

#36
The Clue in the Embers

1955 • 5 Readers • 214 pages 3

#37
The Ghost at Skeleton Rock

1957 • 5 Readers • 177 pages 3.3

#38
Mystery at Devil's Paw

1959 • 4 Readers • 193 pages 3

#39
The mystery of the Chinese junk

1959 • 4 Readers • 160 pages 3

#40
Mystery of the Desert Giant

1960 • 6 Readers • 160 pages 3.5

#42
The Viking Symbol Mystery

1962 • 4 Readers • 192 pages 3

#45
The mystery of the spiral bridge

1965 • 4 Readers • 160 pages 3

#47
Footprints under the window

1933 • 4 Readers • 157 pages 3

#48
Mystery of the Whale Tattoo

1967 • 4 Readers • 192 pages 3

#49
The great airport mystery

1930 • 6 Readers • 158 pages 3

#52
The Bombay Boomerang

1970 • 3 Readers • 192 pages 3

#56
Masked Monkey

1972 • 4 Readers • 153 pages 3

#58
The Shattered Helmet

1973 • 5 Readers • 180 pages 3.5

#62
The Mysterious Caravan

1975 • 5 Readers • 193 pages 3.3

#64
The Witchmaster's Key

1975 • 3 Readers • 192 pages 3

#68
The Firebird Rocket

1978 • 5 Readers • 192 pages 3

#76
Mystery of Smugglers Cove

1980 • 3 Readers • 181 pages 3

#78
The Vanishing Thieves

1980 • 2 Readers • 179 pages 3

#83
Track of the Zombie

1982 • 1 Reader • 194 pages 3

#84
The Voodoo Plot

1982 • 2 Readers • 189 pages 4

#86
Tic-Tac-Terror

1984 • 1 Reader • 201 pages 3

#87
Trapped at Sea

1982 • 1 Reader • 181 pages 3

#88
Game Plan for Disaster

1982 • 1 Reader 3

#94
The Crimson Flame

1981 • 2 Readers • 190 pages 3.5