Hawaii Five-0 Season 8 Episode 6

Mōhala i ka wai ka maka o ka pua (Unfolded by the Water are the Faces of the Flowers)

The murder of two tourists leads Five-0 to a man suffering from multiple personality disorder, where one of them becomes violent and another is a child. McGarrett is accompanied on the case by a stress management consultant, whom Danny and the others have hired to help him manage his health.