The Alienist is an advanced class that introduces psychical abilities into an Victorian-era campaign. While the Alienist publicly claims to be a simple psychiatrist, in truth he has formidable mental powers. Unlike the hermetic disciple and the medium, the Alienist's powers do not come from ancient rituals or consultations with spirits. Instead, the Alienist has learned to unlock the powers within his own mind.
This supplement also deals with the psychical abilities of the Disturbed, untrained individuals that have managed to manifest psychic abilities. Part of the mission of the Alienist is to track these disturbed individuals down and help integrate them into society... or, failing that, removing the threat they pose.