CSI NY serial: The Thing About Heroes...

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Based on the clues that Mac's stalker provides him, he goes to his hometown, Chicago and there he gets more clues which help him realize that the whole thing stems from a moment in his youth. Based on DNA evidence, Mac suspects it's his friend who's behind it but he denies it. Meanwhile back in New York the team is placed in danger by the stalker. Because of the DNA evidence Mac says the only possible suspect is his friend's brother but he doesn't know what happened. Mac later realizes his friend's brother and Stella's suitor Drew Bedford are the same. So he goes looking for him but is captured. So the team tries to find him.