From the world's largest Tiffany clock decorating the 42nd Street entrance to its spectacular main concourse, Grand Central has been a symbol of beauty and innovation in New York City for more than one hundred years. When the body of a young woman is found in the tower suite of the Waldorf Astoria--one of the most prestigious hotels in Manhattan--Assistant DA Alex Cooper and Detectives Mike Chapman and Mercer Wallace find themselves hunting for an elusive killer whose only signature is carving a carefully drawn symbol into his victims' bodies, a symbol that bears a striking resemblance to train tracks. When a second body bearing the same bloody symbol is discovered in a deserted alleyway right next to the terminal building, all attention shifts to the iconic transportation hub. With the president of the United States set to arrive for a United Nations meeting at the week's end, Alex and Mike must contend with Grand Central's expansive underground tunnels and century-old dark secrets--as well as their own changing relationship--to find a killer who appears to be cutting a deadly path straight to the heart of the city.