Barney Sullivan and Mary Morden are prepared to submit to appalling blasphemies and take part in horrific sexual rites in order to penetrate a Satanic circle in an attempt to solve a foul and brutal murder. Sullivan is a secret agent who, horrified by the virtually unrecognisable body of one of his colleagues, becomes involved in the bestialities of Satanism whilst investigating Communist activities which threaten the security of the West; Mary has a past which enables her to put moral scruples aside – as she knows she must if she is to triumph over evil and bring the Devil worshippers to justice…Illustrated by Richard Dalkins.