Jennifer, an Australian girl on the run from her past, turns up in Amsterdam and, in a desperate attempt to blend in, joins a coach-load of tourists on a tour of Holland's old windmills. When the bus breaks down in the middle of nowhere, she and the other tourists are forced to seek shelter in a disused shed beside a sinister windmill where a devil-worshiping miller once ground the bones of locals instead of grain. As members of the group start to disappear, Jennifer learns that they all have something in common – a shared secret that seems to mark them all for doom.

人間ほどの大きな茸が屋敷中に生えて、何度抜いても元に戻ってしまうことに困り果てた何某が山伏に茸退治の祈祷を頼むが、やって来た山伏が呪文を唱えるほどに茸はその数を増して動き回り、ついに二人は茸に追われて逃げ出す羽目に…。