The Raw Shark Texts

When Eric Sanderson wakes from a lengthy unconsciousness, he has no memory. A letter from "The First Eric Sanderson" directs him to psychologist Dr. Randle, who tells Eric he is afflicted with a "dissociative condition." Eric learns about his former life -- specifically a glorious romance with girlfriend Clio Aames, who drowned three years earlier -- and is soon on the run from the Ludovician, a "species of purely conceptual fish" that "feeds on human memories and the intrinsic sense of self."