The ... of this book is deep 1)author 2)characters 3)plot 4)scenes

The plot of this book is deep.

У этой книги хорошо продуманный сюжет.

Is the plot of this book deep?

Is the plot of this book is deep or simple?

Is the plot of this book or this film deep?

Of what book is the plot deep?

What is deep in this book?

The plot of this book is deep, isn\'t it?