The bolded word here is the BESTSELLER. This kind of complement is a direct object complement. The adjective overnight denotes to the object bestseller which is an adjective. Another adjective complements another adjective, thus, the term direct object.
It's called a *Prepositional Phrase.
I can explain further, if you like.
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she treats him very suspiciously and is still somewhat angry because she knows he had an affair with Abigail. the problem of the relationship is that he had an affair with Abigail and she watches his every move because she is suspicious and worried it might happen again.
Answer:
Could you please explain a little more?
