Wasn't able to follow the characters very well. Intriguing book but lost interest. Hopefully will be able to try again later

For those who don't know, F is one of New York's underground lines, and one dreadful night, a retired FBI agent, on his way home at three o'clock in the morning, is confronted by a terrible scene on an F line carriage: the seven occupants of the coach are all dead. It is clear that this was not a shooting and that death was instantaneous. The seven dead appear to be unrelated, except for a young white man and an African-American woman, whose position in the death suggests a relationship. It does not escape the retired detective's notice that, before he died, the man had time to pull out a gun, which looks to him in every way like a service weapon. The NYPD homicide section, in the person of Detective Flo Ott, investigates, uncovering secrets having to do with national security and international political figures.
While reading you can feel the terrible coldness that accompanies the detectives during the investigation on your skin, and the characters are deep without being the usual desperate introverts. One of these characters, however, is one character too many, since when he appears he fails to do the damage such a character could do, then he simply disappears without the conflict concerning him being resolved. Too bad.

Posted on Goodreads.