Knights and Knaves 2 Puzzle

The Puzzle:

Knights and Knaves 2
There are three people (Alex, Brook and Cody), one of whom is a knight, one a knave, and one a spy.

The knight always tells the truth, the knave always lies, and the spy can either lie or tell the truth.

They are brought before a judge who wants to identify the spy.

Alex says: "I am not a spy."
Brook says: "I am a spy."
Now Cody is in fact the spy. The judge asks him: "Is Brook really a spy?"

Can Cody give an answer so that he doesn't convict himself as a spy?


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