He discovers Livia Emberday, the mistress of the house, has turned to crime in order to bolster the family's flagging fortunes.

With assistance from an order of bogus nuns, stolen goods end up in the warehouse of Hamlyn, purportedly a respectable businessman.

[6] The Monthly Film Bulletin wrote: "Take one of England's statelier homes, serving as headquarters for a ruthless criminal conspiracy by a sisterhood of nuns engaged in smuggling, bank-robbery and murder; add a matriarch behaving like a genteel Doctor Mabuse, whose son is kinky for French girls' blonde hair, and whose daughter displays marked transvestite tendencies; throw in Robert Morley pouting petulantly, and you should have the ingredients for an entertaining thriller.

Susan Hampshire and James Culliford adequately portray mental imbalance, and there is an excellent performance by Cathleen Nesbitt, of whom one would happily have seen much more.

"[10] The soundtrack composed by Peter Thomas was released in 1968 on a library music LP Jazz Graphics / The Spy Set (KPM 1042)[11] without any reference to the film.