London: Collins / The Crime Club, (1968) dj. Hardcover first edition - Mystery featuring Superintendent Roderick Alleyn by this New Zealand-born author who was considered (along with Agatha Christie, Margery Allingham and Dorothy L. Sayers) one of the four "Queens of Crime" during the Golden Age of Detective Fiction His wife Troy finds herself on a river cruise with an international crook known as 'the Jampot' - and the peace of the cruise is destroyed by two murders. The 'Constable' in the title refers to the artist John Constable. Illustrated endpapers. 287 pp. Dust jacket by Kenneth Farnhill.