The supernatural, the surreal, and the all-too real . . . Such tales of the dark and the unknown have always fascinated us, and modern authors carry on the disquieting traditions of the past while inventing imaginative new ways to unsettle us. Chosen from a wide variety of venues, these stories are as eclectic and varied as shadows. The latest volume of The Year's Best Dark Fantasy and Horror edited by fantasy aficionado Paula Guran offers...