NBC's Law & Order triumvirate is set to kick off the season with a blockbuster three-show crossover event called "Gimme Shelter." The episode, written by showrunner Rick Eid, features a vast criminal enterprise with international components from Eastern Europe that begins with a homicide and leads to sex trafficking and an imminent terrorist attack on New York City. The top cops and lawyers from each show are involved in one of their biggest cases ever, as they work together to prevent another high-casualty NYC attack. Complications arise as L&O's DA Jack McCoy and ADA Nolan Price go after the international ring, but fans can expect to see characters working together who have never teamed up before.