Hawaii Five-0: Watch Season 4 Episode 20 Online

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When does the story about a pool cleaner involve some very dirty business?

When that pool cleaner ends up dead, that's when.

Such is the case Hawaii Five-0 tackles on Season 4 Episode 20, an installment that led the team to uncover a possible terrorist cell of radicalized students.

Are they truly plotting an attack on U.S. soil?!? Watch Hawaii Five-0 online now for a lot more:

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.