Step on a Crack by James Patterson
Not an Alex Cross book, although the title does make it sound like it is.
Terrorists take hostages at the former First Lady's funeral in NYC.
On a side note, the main character's wife is dying of Uteran cancer and he has 10 kids. Devastatingly one of my dearest friends died of this same cancer on valentine's Day. This book does not pull any punches, so be forewarned. I had to put the book down and bawl a few times.
Still a great read.