When you are reading a novel, during or after it is finished, you discover that everything is on the surface. It is what the characters are doing and how they react to others, but nothing more is revealed. They have little or no baggage and the story lacks real interest other than the topic that is dealt with.
Crime – You take the reader along with you following all the clues until the murderer is caught. And introduce a romantic relationship along the way for interest.
But it’s not enough. Readers expect more. And a writer doesn’t want the reader to tire of his novels and think they are all the same – shallow without depth.
Perhaps one has to introduce a new character who had a relationship in the past with the person who is dead. Now that would produce depth to the story, especially if the daughter didn’t know he was her father – it’s a start in the right direction.