Clutch of Constables

Clutch of Constables is a detective novel by Ngaio Marsh; it is the twenty-fifth novel to feature Roderick Alleyn, and was first published in 1968. The plot concerns art forgery, and takes place on a cruise on a fictional river in the Norfolk Broads; the "Constable" referred to in the title is John Constable, whose works are mentioned by several characters.