Rachel Prince joins the for the holiday of a lifetime accompanied by her parents and her octogenarian friend, Lady Marjorie Snellthorpe. They are shocked when a nun who is part of an exclusive religious party collapses and dies. Could the death have been a result of natural causes? Rachel's best friend - cruise ship nurse - is keen to believe this is the case if it means keeping Rachel out of trouble. Rachel is not convinced, and believes the death is suspicious, particularly when her father shares the nun's dying words. The chief of security initially asks Rachel to assist as all is not what it seems within this religious order but changes his mind when the FBI come aboard. Will Rachel listen? Marjorie is as keen as ever to do a little sleuthing of her own, can she keep Lady Marjorie safe while uncovering the mystery. In the most dangerous challenge to date, Rachel must keep her wits about her to find out what is at stake and discover who is responsible for the nun's murder.