The Naked Face (English, Paperback, Sidney Sheldon)

Two people closely involved with Dr. Stevens have already been killed. Is one of his patients responsible? Someone overwhelmed by his problems? A neurotic driven by compulsion? a madman? Before the murderer strikes again, Judd must strip away the mask of innocence the criminal wears, uncover his inner emotions, fears, and desires – expose the naked face beneath…
Source- Goodreads.com