I had to take Counselling and Guidance to complete my undergrad degree. Part of the class (and a major part of your grade was roleplaying different issues a psychologist would be expected to experience in a client. The campus was only about 1200 students, and it became obvious in many cases, who the ‘client’ was modelling their issue after. Yeah, names were changed, but personalities and other characteristics often gave away the real person.
Agatha Christie?