Dybbuk Kokos, a feisty soul-stealing demon of medieval Jewish folklore, has been trapped in a tree for two hundred years. When lightning strikes and Kokos is released, she finds herself in the world of the 20th century -- as the disgruntled employee of the multinational corporation, Mephistco. In order to keep her job and fulfill an ancient curse, Kokos must hunt down the descendant of the woman she was instructed to haunt centuries ago. No easy task, as that descendant happens to be Rainbow Rosenbloom -- London taxi-driver, film critic, lesbian, and niece to a pack of formidable aunts.

As the hilarious tale unfolds, both Rainbow and her dybbuk discover that History still holds a few tricks up her sleeve.