Memory Man – David Baldacci

Amos Decker is a former professional football player whose career was ended by a terrible hit. Now a police detective, Amos is still haunted by a side effect from the accident he can never forget. One night Decker comes home from a stakeout to find his wife, young daughter and brother-in-law horrifically murdered. Obviously scarred and nearly broken, Decker has to use his skills as a detective and his unusual brain capacity to try and catch the monster who killed his family.