Only Joan (Phyllis Thaxter) knows the real reason she fainted at her engagement party and suddenly deserts her fianc, Bob (Henry H. Daniels, Jr.). Its the command of the sinister, vengeful Karen, a terrifying alternate personality raging inside Joan who will ultimately direct her to kill. Not even the psychiatrist (Edmund Gwenn) who discovers her fate can stop the tormenting voice that controls Joans every move forcing her to run, to hide, to plot and to murder. Writer/director Arch Oboler, who adapted his successful radio play into this shocking thriller, keeps the suspense taut and the action filled with unexpected twists as Joans murder trial unfolds before a mesmerized courtroom. **Please be aware that this isa manufactured on demand disc that was created using a DVD-R disc. It should play in all standard DVD players.