H.G. Wells' the Invisible Man

A beautiful but frightened young woman escapes a mental hospital where she's been held, and appeals to Peter for help. Her boyfriend, George, is on death row for murdering a police inspector and she has a photo proving he was elsewhere the day of the killing. It quickly becomes obvious that Dr. Trevors, who runs the hospital, is more interested in keeping his patient quiet than in saving George from the gallows.