What does Cathy joining a motorcycle gang, two elderly ladies who own a watermill and claim to be witches, and all of the clocks stopping at a local atomic research station have in common? They're all present in Brian Clemen's first great step into the bizarre.

Deaf botanist Alan Carter's fiancee walks away from their floral bliss under some strange influence, and is picked up by an entranced chauffeur. Has it got anything to do with the giant seed from outer space that has landed nearby?...