White witch Cara finds, trough her buzzard, four of the five youngsters born on the same day as descendants of their predecessors to perform the same job. Every 199 years, a sinister astronomical conjunction allows Mordus, an evil spirit seeking to kill humanity trough smoke and fire, to get free. Only the five can, by a method revealed in a book only they can read as a group, return him to the bog in time. But Mordus's earthly helper, a blacksmith, has got hold first of Sam, the fifth, and even plans to use him as acolyte to eliminate the four.