The fantastic Louis Theroux returns to our screens tonight with this brand new series where the presenter immerses himself in the world of Ohio’s State Psychiatric Hospitals. Never one for an easy challenge, is that Louis! The series will see him meeting patients who have committed crimes, sometimes horrifically violent ones - while in the grip of severe mental illness. Over the course of this two-part series, Louis will be taking a closer look at mental illness in an attempt to understand how society cares for some of its most vulnerable and most dangerous members. Undoubtedly intense viewing, but where Louis Theroux is concerned, it's always must-see.