Samhain is the ancient Celtic word for summer's end, and is also the third and final harvest holiday in the Witches' Wheel of the Year. You may know this holiday as Halloween. Whatever you call it, this is the time of year when the veils are thin and spirits are said to walk the earth. Find out what this holiday means for contemporary witches and learn about what you can do to celebrate it at home with our special guest, writer and tarot reader, Jessica Jernigan, author of "A Postmodern Witches' Guide to Halloween."