«Flash Point» by Colby Marshall

A unique forensic psychiatrist must decipher clues left behind by assassins attacking D.C. in this psychological thriller from the author of Color Blind.A band of ruthless assassins converges on a bank in Washington, D.C. They slaughter everyone inside and escape without stealing a dime, leaving only a message for police warning that another attack is coming. The attackers are more than willing to communicate who they are and what they want. The problem is, they only do so through cryptic messages hidden in a labyrinth of classic literature references.With the clock ticking down the hours and minutes until another bloodbath, Dr. Jenna Ramey and the rest of the FBI’s Behavioral Analysis Unit have a challenge profiling not one or two, but a dozen individual killers. But even if she can save the day, two enemies from Ramey’s past are lurking in her blind spot, ready to take advantage of her current preoccupation…
“Just the gift for connoisseurs of multiple murders who also want to plume themselves on their knowledge of literary classics.”—Kirkus Reviews
“Absorbing…Adding spice is Jenna’s special gift, grapheme-color synesthesia, which allows her to use colors she associates with people and situations to help her determine the truth.”—Publishers Weekly