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The second season concludes with Frank attempting to stop a biological-weapons attack on the city, while trying to keep it a secret from his family on Mother's Day. Meanwhile, a long-standing conflict between Danny and Jamie comes to a head.
Danny and Jackie are taken off a murder case involving a bride and reassigned to protect a Central American president, who's under threat of assassination. Elsewhere, Vinny performs an unjustified stop, causing Jamie to challenge his tactics.
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