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 The Reason Why:

While walking in a Wall Street concrete park, Ed Blake encounters a vaguely familiar woman. After an attraction forms, he begins an affair that, in time, threatens his marriage, family and job. When the undiscovered relationship ends abruptly, he is haunted by the memories; the affair becomes known and he struggles with the impact on his marriage. Throughout, he is challenged to explain why he began the involvement and failing to do so, he loses nearly everything