Katherine Yoder has loved Johnny Mullet since they were children, but he never actively returned her affections. Like so many things in their world, he assumes Katherine will always be there. For several weeks, Katherine has been plagued by severe headaches and dizziness. While resting at home, Johnny unexpectedly visits, but when dizziness strikes, she loses consciousness. She awakens hours later in a hospital bed, unable to remember how she got there. As Katherine struggles to recall recent memories of Johnny, a surprise visitor arrives in her already unsteady world--a man named Isaac who claims they had been writing letters to each other, even considering marriage, before her illness.