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As Andy Sipowicz (Dennis Franz) and Bobby Simone (Jimmy Smits) try to determine the motive for an Indian matron's murder, Andy has problems with the new temporary PAA. Now back on the force, Martinez (Nicholas Turturro) teams with Medavoy (Gordon Clapp) to connect a bizarre robbery with a widespread credit-card scam. And, in her efforts to nail an illegal-weapons dealer, Diane Russell (Kim Delaney) insists on going it virtually alone -- and reacts violently when Bobby offers to provide backup.