The Diamond of Darkhold (Book of Ember, #4)

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Amy Brown
This answer contains spoilers… (view spoiler)
Suzanne Brayton No, it is a type of solar collector for electricity.
Serket On the HMH website it says: "Reading Counts! has been retired and will no longer be available for purchase."…moreOn the HMH website it says: "Reading Counts! has been retired and will no longer be available for purchase."(less)
Serket Amazon considers it the third book, but it was actually the final book to be published so Goodreads is correct to call it the fourth book.

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