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Mac, Sheldon, Jennifer, Peyton and Lindsay investigate the mysterious death of a party-goer found in a subway car where the victim initially appears to have bled out, but the cause of death is determined to be multiple organ failure. The team must track the promoters of the subway raves to find what killed the young woman before another victim is found dead at one of their secret gatherings. Meanwhile, when one of New York's most eligible bachelors is found dead in the swim gym of his penthouse apartment, Stella, Det. Flack and Danny question his "room maids," beautiful women hired to clean the homes of the wealthy in exchange for room and board.