Londoners Paul and Tricia Feenan move to the isolated Holiwell village where Tricia has inherited a property. In the village, there are centuries-old stones used during the Great Plague as boundary markers. No plague-sufferer was allowed to pass the stones and enter the village. The plague diminished, and the village survived unscathed. An ancient ceremony is performed each year to renew the village boundaries. A miguided act by the Feenans' son then reminds the village there's a reason traditions have been rigidly stuck to.