There are 4 books in the Harriet the Spy series. The newest book is Harriet Spies Again which came out in 2003.

1
Harriet the Spy

Book cover of Harriet the Spy
First published in 1974, a title in which Harriet M. Welsch, aspiring author, keeps a secret journal in which she records her thoughts about strangers and friends alike, but when her friends find the notebook with all its revelations, Harriet becomes the victim of a hate campaign.

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2
The Long Secret

Book cover of The Long Secret
Harriet the Spy refuses to become ruffled when an unidentified person starts leaving disturbing notes all over the quiet little beach town of Water Mill. She’s determined to discover the author of the notes. And she drags her friend, mousy Beth Ellen, into all kinds of odd and embarrassing situations…

3
Sport

Sport

Sport: Almost Everything You Ever Wanted to Know tells the history of sport. All sport. Ever. From ancient times to the 21st century.

In eight themed parts, Tim Harris describes the triumphs and breakthroughs - as well as the cheating and skulduggery - that have created the modern world of…

4
Harriet Spies Again

Book cover of Harriet Spies Again
Harriet M. Welsch has just received the best news of her eleventh year—Ole Golly is coming back! Harriet can still remember how sad she was when her beloved nanny married George Waldenstein and moved away. But the circumstances of Ole Golly’s return remain unclear. Where is George Waldenstein?
   With Mr.…