“This case is as simple as black and white.”
How is this case literally about black and white?

I don't know which case you're talking about but it's most likely suggesting that the sides in this case are easily distinguishable.

I think your question is incomplete. Is there more to it that helps explain the actual question? Either way, something being "as simple as black and white" means that it is obviously different than it is perceived due to human error (most of the time)

Explanation:

judy jones is an attractive woman who receives attention from many men throughout the story.   despite her beautiful appearance, she is superficial and callous.   she is an aggressive woman who goes after any man she desires but she is not happy.   she is fickle and is never satisfied.   her beauty is only skin deep.   dexter breaks down because he knows his dreams are unattainable.   he believes that wealth and physical beauty are what will make him happy.   he soon realizes that she has lost her attractive looks.   it is not all what he had planned.

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