The murder of a ballerina is investigated by Sherlock and Joan, and evidence seems stacked against the dance company's star performer, Iris. An audio recording released to the tabloids reveals Iris's intimate relationship to the victim, but Sherlock deconstructs the recording and deduces that Iris's lawyer was the murderer and was trying to use the impending trial against Iris as a way to elevate his firm's reputation. The police find a stolen hard drive with surveillance footage at the lawyer's home which was the missing evidence to charge the lawyer. Meanwhile, Joan looks into a missing homeless man, prompting her to open up to Sherlock about her biological father who is schizophrenic and lives on the street. Joan locates the missing homeless man and uncovers a plot to kidnap homeless people for their benefit checks.