Speedle and Delko are present when a trendy nightclub catches fire, apparently from a deejay's pyrotechnics display, killing 16 people and injuring dozens of others. But the ensuing investigation reveals it may have been arson to cover up a murder. Also: Horatio probes the death of a prostitute who is found dead in a judge's bathroom in his home. D.J.: William Lee Scott. Danny: Ben Browder. Haid: Richard Edson. Veronica: Lisa Gerber. Connie: Jaclyn Gutierrez. Jameson: John F. O'Donohue.