The book is briefly glimpsed in the theatrical version, but the director’s cut offers a canonical interpretation of the time travel paradox that Donnie is at the epicenter of.
However, if the manipulated living dies in the duplicated universe, they become the Manipulated Dead, who can move through time and directly guide the Living Receiver.
Frank clearly fits this description, as a version of him dies in the Tangent Universe on Halloween Night, implying that he traveled back in time to warn Donnie.