Possible Clues:

• Area next to the narthex
• Middle of wheel requiring jack, by the sound of it
• Place for a mass meeting?
• The body of a church
• Part of the church sounds like a rogue
• Part of a church sounds roguish
• It sounds as if Jack is there with the congregation
• It sounds as if Jack is in the church
• Sounds as if Jack is low church
• The hub of a wheel, or body of church