Trivia-On-Books Memory Man by David Baldacci

Still devastated after the brutal murder of his family one year before, detective Amos Decker is called back into action when there is a report of a massive shooting at a school. Upon further investigation, Amos finds that the man who murdered his family and the one who took down so many school children may be one in the same. Ironically, Amos Decker is afflicted...