Holmes and Watson uncover the identity of a serial killer whose case has gone cold and find themselves butting heads with the NYPD.
McCall investigates a community activist's staged suicide and uncovers a connection between his murder and his protests over local real estate development. Also, Delilah's driving lessons lead McCall and Aunt Vi to teach her an even bigger lesson regarding personal accountability.
When two motorists driving gas-guzzling cars die at the hands of a sniper, Danny and Kate are put on the case of what the city believes is the work of a radical environmental serial killer.
When Iggy and Kapoor discover a patient might be suffering from lead poisoning, they are forced to take on the city. Meanwhile, Max's unsolicited attempts to help a patient backfires.
As the team works together to take down a foe, Jane and Weller face a toxic secret that threatens to tear them apart in the fall finale.
