Dick Wolf's second installment in his bestselling series starring NYPD Detective Jeremy Fisk pits him against a top assassin working for a nefarious cartel.

A number of bodies are discovered on the United States' border with Mexico, each marked with a hummingbird symbol. Detective Cecilia Garza of the Mexican intelligence agency recognizes it as the calling card of a killer called Chuparosa. Garza has been pursuing this man for years, yet knows little about him, except that he's heading to New York City—along with the rest of the world.

It's United Nations Week in Manhattan and Jeremy Fisk can't let a devastating loss keep him from safeguarding the city and the world's leaders. Complicating matters is the news of a mass murder in the city—and the arrival of a very determined Mexican detective.

To stop Chuparosa, these uneasy allies must learn to work together—and Fisk will have to learn the hard way that justice is not always blind.