Ephraim is horrified when he comes home from school one day to find his mother unconscious at the kitchen table, clutching a bottle of pills. Even more disturbing than her suicide attempt is the reason for it: the dead boy she identified at the hospital that afternoon - a boy who looks exactly like him. While examining his dead double's belongings, Ephraim discovers a strange coin that makes his wishes come true each time he flips it.
Ephraim thought his universe-hopping days were over. He's done wishing for magic solutions to his problems; his quantum coin has been powerless for almost a year, and he's settled into a normal life with his girlfriend, Jena. But then an old friend crashes their senior prom: Zoe, Jena's identical twin from a parallel world. Zoe's timing couldn't be worse. It turns out that Ephraim's problems have just begun, and they're much more complicated than his love life.