Maggie Walsh (Ross) and her boyfriend Pete Danner (Elliott) are interior decorators from California. They are retained by an anonymous British client. Their reluctance to abandon their current client in Los Angeles is alleviated when that client dies suddenly in mysterious circumstances. Taking advantage of their pre-paid airfare, they travel to England and are immediately involved in a traffic collision with a limousine. The passenger reveals himself as their mysterious benefactor, Jason Mountolive (John Standing), who invites them to his rambling estate, Ravenhurst.