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Sherlock investigates a bomb that blew up killing two young men in an office building. He discovers that the bomb had been planted four years previous and didn't go off when it was suppose to.The CEO of the PR firm, Heather Vanowen (guest star Lisa Edelstien) planted the bomb to cover up her escort service in the past. Watson tries to find a sponsor for Holmes but he is proving to be difficult making Joan question if Sherlock wants her gone or not.