Highlights from the Twentieth Episode of Season 2 of Blue Bloods

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Danny (Donnie Wahlberg) and Jackie (Jennifer Esposito, right) are assigned to protect a key witness in a Russian mob trial, but when an attempt is made on her life, they realize there is a mob informant on the task force. Photo: John P. Filo/CBS ©2012 CBS Broadcasting Inc. All Rights Reserved.