In rare instances (such as Jack's), a person may die in one world but not the other, making the survivor "single-natured" with the ability to switch back and forth, body and mind, between the two worlds. Jack is taught how to flip by a mysterious figure known as Speedy Parker, who is the twinner of a gunslinger named Parkus in the Territories. In the Territories, the beloved Queen Laura DeLoessian, the twinner of Jack's mother (a movie actress known as the "Queen of the B Movies") is dying as well.