The Exorcist 1×05 “Through My Most Grievous Fault” – The exorcism begins. As the storm of the century descends upon Chicago, Father Tomas and Marcus engage the demon in spiritual warfare. But the demon is ready and waiting with a few secrets of its own. Meanwhile, the demon’s manipulations slowly begin to drive a wedge between members of the Rance family. Loyalties will be tested and lives will be forever changed in the all-new “Chapter Five: Through My Most Grievous Fault” episode of THE EXORCIST airing Friday, October 21st on FOX.