Alan Williams is found dead having rung The Saint for his assistance. Pop singer Diane Huntley, a friend of Alan's, takes the Saint to meet a guru who runs meditational sessions at a hefty price, and the Saint is convinced the guru is behind the murder. Diane tells the Saint that Alan had a younger sister Brenda, who also saw the guru and who committed suicide. Alan had painted a portrait of Brenda and in its frame are hidden various documents which will lead the Saint to avenge his friend's death.