What secrets are hidden within the misty marshes near Land’s End in England? During the 1920s, a pair on their way to Land’s End, England, finds themselves without gasoline while enveloped in thick fog. It's then that the woman (Veronica Carlson) meets an unusual gardener (John Hurt) and encounters the estate of a former clergyman (Peter Cushing), who resides there along with his Indian servant and… something else…