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The CSIs investigate a fire at a music venue that leaves four people dead, including two band members.
An undercover cop infiltrates a Boston mob crew that has a mole in the state police department.
Danny and Baez investigate a drag queen's homicide. Elsewhere, Erin takes a second look at a narcotics case after the accused man's mother kidnaps her. Directed by series star Donnie Wahlberg.
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