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The case of a cyber killer, who appears to be targeting medical health-care workers, turns personal when the suspect invokes the name of Mac's father who had died nearly two decades earlier.
Following a spray of machine gunfire, the CSI team rises from the chaos. But when one member's life is significantly changed, it proves to be the emotional motivation they need to piece together their lives and ultimately find the shooter.
Mac and the crime lab deal with a killer who is using compasses to leave clues to his crimes.