The Book of Sand is a late collection of short stories by Borges. In the title story, a strange book with no beginning and no end comes into a narrator's hands and begins to trouble him. Other tales deal with doubles, dreams, gods, Norse sagas, and the way people meet their own past selves. They are brief and polished, with simple surfaces and unsettling ideas underneath. The book shows the mature Borges returning to his favorite puzzles with calm and economy.