Lets consider the following:
The book doesn't explain, "What's the wisdom behind education?"
Changing this to an indirect question becomes the following:
The book doesn't explain what the wisdom behind education is.
Now, I found many instances on Google where structures like this weren't really converted to indirect questions. For example:
The book doesn't explain what's the wisdom behind education.
"[She] doesn't say what's really on her mind."
Edit:
And consider the following:
What's the logic behind it.
(a) I wonder what's the logic behind it vs. (b)I wonder what the logic behind it is.
(a) sounds better but why?
And are these constructions acceptable?
Best Answer
Grammatically speaking, the last two examples are quite different. In the first example, what substitutes the predicative
Now, in the second example, what substitutes the subject.