The Three Investigators books in order
The Three Investigators by Robert Arthur Jr. has 18 books, published 1964–1975. Reading all of them takes about 52 hours (2,822 pages). 18 can be borrowed free from Open Library.
Reading order
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Book 1 · 1964
The Secret of Terror Castle
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Book 2 · 1964
The Mystery of the Stuttering Parrot
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Book 3 · 1965
The Mystery of the Whispering Mummy
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Book 4 · 1965
The Mystery of the Green Ghost
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Book 5 · 1966
The Mystery of the Vanishing Treasure
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Book 6 · 1966
The Secret of Skeleton Island
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Book 7 · 1967
The Mystery of the Fiery Eye
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Book 8 · 1967
The Mystery of the Silver Spider
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Book 9 · 1968
The Mystery of the Screaming Clock
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Book 10 · 1968
The Mystery of the Moaning Cave
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Book 11 · 1969
The Mystery of the Talking Skull
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Book 12 · 1969
The Mystery of the Laughing Shadow
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Book 14 · 1970
The Mystery of the Coughing Dragon
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Book 16 · 1971
The Mystery of the Nervous Lion
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Book 17 · 1972
The Mystery of the Singing Serpent
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Book 19 · 1973
The Secret of Phantom Lake
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Book 23 · 1975
The Mystery of The Invisible Dog
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Book 44 · 1985
The Case of the Weeping Coffin
Questions people ask
How many The Three Investigators books are there?
There are 18 books in the series, published 1964–1975.
Which The Three Investigators book should I read first?
Start with The Secret of Terror Castle (1964), book 1. The list above is the reading order.
How long does it take to read the whole series?
About 52 hours at an average pace of 250 words a minute, or 2,822 pages in total. The longest book is The Mystery of the Screaming Clock at 177 pages.
Can I read The Three Investigators for free?
18 books can be borrowed free from Open Library with a free account. The book pages have the links.