In this work, Karen Jolly uses the Elf Charms from the Lacnunga and Bald's Leechbook as a window into popular religion in late Anglo-Saxon England, The book provides a great deal of information on the elf-charms themselves, but its significance goes well beyond that.
The full value of Jolly's work is found through the way she explores Anglo-Saxon popular religion, the process of conversion to Christianity, and tensions between formal and popular religion, and the tensions between magical and religious elements. This is a far more important work than the title suggests, and I would highly recommend it to anyone interested in Anglo-Saxon times.