In the genteel environs of Corduroy Mansions, Pimlico, strange doings are afoot, mostly in the name of love. Lonely William French and his faithful canine Freddie are recruited to the service of MI6 by a beguiling lady operative, William's neighbour Caroline finds her suitor James mysteriously lacking, and Barbara Ragg is tempted to the Highlands by blossoming romance... . . . . . . . . . . . . . . . . . . . . .