There are 4 books in the The Tripods series. The newest book is When the Tripods Came which came out in 1990.

1
The White Mountains

Book cover of The White Mountains
Monstrous machines rule the Earth, but a few humans are fighting for freedom in this repackaged start to a classic alien trilogy ideal for fans of Rick Yancey’s The 5th Wave.

Will Parker never dreamed he would be the one to rebel against the Tripods. With the approach of his…
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2
The City of Gold and Lead

Book cover of The City of Gold and Lead
Will and his friends return to the City of the Tripods—and risk their lives—in this second book of a classic alien trilogy ideal for fans of Rick Yancey’s The 5th Wave and Margaret Peterson Haddix’s Shadow Children series.

When Will and his friends arrived at the White Mountains, they thought…

3
The Pool of Fire

Book cover of The Pool of Fire
Will must defeat the Tripods once and for all in this third book of a classic alien trilogy ideal for fans of Rick Yancey’s The 5th Wave and Margaret Peterson Haddix’s Shadow Children series.

After being held captive in the City of Gold and Lead—the capital, where the creatures that…

4
When the Tripods Came

Book cover of When the Tripods Came
Experience the beginning of the Tripods’ reign in this prequel to the classic alien trilogy ideal for fans of Rick Yancey’s The 5th Wave and Margaret Peterson Haddix’s Shadow Children series.

When it comes to alien invasions, bad things come in threes.

Three landings: one in England, one in Russia,…