Unfaithful Unto Death

Time: the present. A bumbling amateur female sleuth solves the murder of Princess Jezebel on a cruiseliner. Although a dunce at deduction, Sheil B Wright is well versed (through her folk ballads) in human folly and traumas of the heart.
Her investigation, including two subsequent murders, infuriates pedantic Police Superintendent Sheryl Holmes, Australian descendant of the great Sherlock. Locations include shipboard, a Swan Valley vineyard, and a despotic island sultanate.