When a dancer is found on the New York City subway tracks, Killian and Morales' investigation into her mysterious death challenges their tried-and-true detective work. Also, the grand opening of Goody's is put in jeopardy and Quinlan and Bentley's relationship hits a speedbump.

When the 7-4 investigates a fatal fire at a hair salon, Killian and Morales turn to Dr. Ken Corley, a medical examiner with ties to Regina's past, and fire marshal Nicky Greenville for crucial insight. Also, Haywood announces a new policy without discussing it with Suarez, and Quinlan worries about Bentley's worsening nightmares.