From creepy picture books to Harry Potter, Lemony Snicket, the Spiderwick Chronicles, and countless vampire series for young adult readers, fear has become a dominant mode of entertainment for young readers. The last two decades have seen an enormous growth in the critical study of two very different genres, the Gothic and children's literature.

The Gothic, concerned with the perverse and the forbidden, with adult sexuality and religious or metaphysical doubts and heresies, seems to represent everything that children's literature, as a genre, was designed to keep...