Margery Allingham's Albert Campion Returns in Mr Campion's FoxBook - 2015
The Danish Ambassador has requested Albert Campion's help on "a delicate family matter." His 18-year-old daughter has formed an attachment to a most unsuitable young man. Before Mr Campion can act on the matter however, both the Ambassador's daughter and her beau disappear without trace. Then a body is discovered in a lagoon.