I read in a grammer book about the funtion of the following noun clause:

I want to find out what the reason for the action is.
According to me, this noun clause should be object of preposition(out); but the book says it is the object of verb.
My reason is (to find out) ,here, is not a verb but a verbal(infinitive).

I need more clearification on this.
'want' is transitive, and it takes the infinitive phrase 'to find out' as its object.
'to find out' is also transitive, and it takes the noun clause 'what the reason...' as its object.
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Dear Casi;
Thank you for the response.
You're welcome.