The musical centres on the “Jellicle Tribe”, a tribe of cats who meet once a year at the Jellicle Ball, where they rejoice with their leader, Old Deuteronomy. During the Jellicle Ball, only one of the cats will be selected by Old Deuteronomy to go to the Heaviside Layer, be reborn and come back to a different life, which is known as a “Jellicle Life”, just before dawn.