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Realizing that Danny (Rick Schroder) and Diane (Kim Delaney) are too tense and high-strung to continue working together, Fancy (James McDaniel) assigns each of them to a different case. While on assignment, Diane again runs into her old nemesis Denby (Scott Cohen), who may be using a courier service for an illegal operation. And after tracking down Sid Thompson (Phil LaMarr), a suspect in two brutal subway murders, Danny completely loses it and beats Thompson to a pulp -- thereby seriously damaging his case against the alleged perp. At this, Andy (Dennis Franz), who has tried to keep Danny on an even keel, angrily washes his hands of his partner. The episode comes to an explosive conclusion when Denby shows up at the precinct for a final showdown with the relentless Diane.