James Patterson 
Cross 

Alex Cross was a rising star in Washington, DC, Police Department when an unknown shooter killed his wife, Maria, in front of him. Years later, having left the FBI and returned to practising psychology in Washington, DC, Alex finally feels his life is in order… Until his former partner, John Sampson, calls in a favour. John”s tracking a serial rapist in Georgetown and he needs Alex to help find this brutal predator. When the case triggers a connection to Maria”s death, could Alex have a chance to catch his wife”s murderer? Will this be justice at long last? Or the endgame in his own deadly obsession?