indsay is assigned a case in which three people were gunned down on a BART train. With pressure from the mayor's office to make an arrest to quell rising fear from the public about riding the subway, the team tries to figure out which victim was the main target and which just happened to be at the wrong place. Finding the murder weapon goes a long way towards this goal. Meanwhile Lindsay meets Tom's new girlfriend Heather, unexpectedly; and Jill and Luke's relationship heats up.

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