Persistence of Memory is the tenth novel by American teen author Amelia Atwater-Rhodes and is the fifth novel in her Den of Shadows series. Published on December 9, 2008 the novel tells the story of Erin Misrahe and her struggles with her alter-ego Shevaun, who is in fact a vampire with whom Erin has a link. The novel also mentions a character from Atwater-Rhodes's previous novel, In the Forests of the Night (1999), Alexander, the brother of the protagonist, Risika.