An old monastery in a small, remote village in Suffolk, England has been haunted by a local legend for centuries. Left in ruin and shrouded by the mystery of a dark spirit that wills young couples to suicide, the place has been avoided for years, marked only by a twisted, ancient tree with an ominous hollow said to be the home of great evil. When four friends on holiday explore the local folklore, they realize that belief in a myth can quickly materialize into reality, bringing horror to life for the town.

Well meaning friends try to persuade Suzanne, a beautiful widow, to remarry and the choice seems to be between Frank, a philandering dentist, and Tony, a sensitive, failing sports trainer who helps her son.

It's Christmas Eve, 1938, when Madge Arwell comes to the aid of an injured Spaceman Angel as she cycles home. He promises to repay her kindness - all she has to do is make a wish.