The title is a British expression to denote a traumatic or unpleasant experience in one's life, especially something shocking, or distasteful that is concealed, or kept secret.
Copyright 1972. Oh, how times have changed.
The book begins to idyllically describing the Island of Jersey and various aspects of it from flora, fauna, to architecture...then spends little time before Mortdechai's friend's wife is raped. Even the reaction of everyone looks so condescending with several "there, theres". I would like to think that it is both an exposure of the prevailing attitudes.
The debate about even reporting the rape is shocking to modern ears; they never do because of the 'disgrace', albeit, it is made clear that by the next morning, the news had spread through the island.
As this is the time of the rise in interest of Witchcraft, and the link of it to Satanism, and its rise, tossing that into the story makes this a very strange book indeed; referencing the Malleus Maleficarum is a surprise. Set around May Day, Walpurgisnacht, makes it a perfectly wicked connotation. The discussion of Witchcraft, and the "Old Religion" draws entirely upon folklore, and transcripts of what witches did for their Sabbath; killing babies, flying ointments, and ritual sex-- in this case, the rapes. After consulting a Witchcraft expert from his old university, Mortdechai finds a defrocked priest to perform a specific mass, The Mass of Saint-Sécaire, so as to banish the serial rapist; assuming he is a Witch and thus believe in the rites efficacy. The priest turns out to be very interested in various psychic phenomena; a rather nice guy, but dies while performing the ritual.
The ritual is one mentioned in The Golden Bough.
The book's darkest turns are when within the last few pages, the rapist is discovered to be their close friend who started the rapes as revenge for another character having sex with his wife (the one in the beginning that claimed rape to cover the infidelity) and is beaten to death by the man that cheated on his wife because he is the first raped. She is so brutalized, and traumatized that she goes catatonic, and eventually kills herself. Upon hearing the news of this, her husband (the one that cheated with the other's wife, mentioned above) promply kills himself. Mortdechai's wife is also raped savagely. The somber ending brings the weight of the subject home, even if handled --what seems barbarically to modern ears -- with silence as they agree to never discuss it.
A very strange ending to the trilogy. Each work unique in itself, and thus, one could read each without reading any other.