A series of violent crime is committed by a man in the Honolulu Police Department officer of late, dismissed cop Patrick Mathus- inherited by his son Oliver, who suffers from a multiple personality disorder, including himself aged five child and the protective father, the one which does the murders. While Five-0 must do everything they can to find him, Danny and Steve's mobilized friends hold an intervention at his home and hire "stress evaluator" Chloe Gordon to try and help McGarrett reduce his stress, given recent medical troubles, and she bravely rides along to stick her nose in everything, not just Steve's affairs.
—KGF Vissers