The Other. Doppelganger. Egregore. They have many names and have been with man through the ages, not a some would think...as some nearly identical twin living elsewhere in the world. They are within. We need them, they need us. Without them we cannot live. Who are Consolata's Companions? Miss Jo-Jo and Drownsie, who live across Old Jerusalem Road. Brade the shipbuilder in Maine, the only other person who has encountered the same companions. Ari and Luce Bohannan, physicians and computer czars. They are DNA and Quantum Computers. There is a sailboat called Sassmatass in the dead of winter, her husband Declan who must find her and bring her home and, above all, her own companion -- the part of herself she encounters after a terrifying accident that simply will not go away. The question: which companions are allies and which are enemies?