38 books in series

Hardy-guttene

Hardy-guttene is a 38-book series with 38 primary works first released in 1920 with contributions by Franklin W. Dixon, Jerrold Mundis, and Leslie H. Morrill.

The Tower Treasure
#1Popular

1927 • 35 Readers • 214 pages • 3.5

The House on the Cliff
#2

1927 • 20 Readers • 138 pages • 3.5

Cover 7

The Secret of the Old Mill

#3

1927 • 4 Readers • 3

The Missing Chums
#4

1928 • 7 Readers • 192 pages • 3

Hunting for hidden gold
#5First

1920 • 9 Readers • 194 pages • 3.7

While the Clock Ticked
#11

1932 • 6 Readers • 174 pages • 3.3

The Hidden Harbor Mystery
#14

1935 • 4 Readers • 177 pages • 3

The Secret Warning
#17

1938 • 6 Readers • 192 pages • 3

The clue of the broken blade
#21

1942 • 5 Readers • 192 pages • 3

The Flickering Torch Mystery
#22

1943 • 5 Readers • 181 pages • 3.3

The Secret Panel
#25

1946 • 7 Readers • 178 pages • 3.3

The sign of the crooked arrow
#28

1949 • 4 Readers • 160 pages • 3

The Wailing Siren Mystery
#30

1951 • 4 Readers • 177 pages • 3

The Yellow Feather Mystery
#33

1953 • 5 Readers • 181 pages • 3

The Secret of Pirates' Hill
#35

1956 • 6 Readers • 178 pages • 3.3

The Clue in the Embers
#36

1955 • 5 Readers • 214 pages • 3

The Ghost at Skeleton Rock
#37

1957 • 5 Readers • 177 pages • 3.3

Mystery at Devil's Paw
#38

1959 • 4 Readers • 180 pages • 3

The mystery of the Chinese junk
#39

1959 • 4 Readers • 160 pages • 3

Mystery of the Desert Giant
#40

1960 • 6 Readers • 160 pages • 3.5

The Viking Symbol Mystery
#42

1962 • 4 Readers • 192 pages • 3

The mystery of the spiral bridge
#45

1965 • 4 Readers • 160 pages • 3

Footprints under the window
#47

1933 • 4 Readers • 157 pages • 3

Mystery of the Whale Tattoo
#48

1967 • 4 Readers • 192 pages • 3

The great airport mystery
#49

1930 • 6 Readers • 158 pages • 3

The Bombay Boomerang
#52

1970 • 3 Readers • 192 pages • 3

The Masked Monkey
#56

1972 • 4 Readers • 192 pages • 3

The Shattered Helmet
#58

1973 • 5 Readers • 180 pages • 3.5

The Mysterious Caravan
#62

1975 • 4 Readers • 193 pages • 3.3

The Witchmaster's Key
#64

1975 • 3 Readers • 192 pages • 3

The Firebird Rocket
#68

1978 • 5 Readers • 192 pages • 3

Mystery of Smugglers Cove
#76

1980 • 3 Readers • 181 pages • 3

The Vanishing Thieves
#78

1980 • 2 Readers • 179 pages • 3

The Voodoo Plot
#84

1982 • 2 Readers • 189 pages • 4

Tic-Tac-Terror
#86

1984 • 1 Reader • 201 pages • 3

Trapped at Sea
#87

1982 • 1 Reader • 181 pages • 3

Game Plan for Disaster
#88

1982 • 1 Reader • 3

The Crimson Flame
#94

1981 • 2 Readers • 190 pages • 3.5