This is another of the recently reissued Nigel Strangeways mysteries written under the nom de plume Nicholas Blake. Blake was really poet Cecil Day Lewis.
This time there is a lot going on for both Nigel and a group of boys who happen to be at a boat pond in Kensington Gardens. What follows is a rather convoluted tale of adventure and spies.
This title will be most enjoyed by fans of Blake and those who like mysteries from the 1950s.
Many thanks to NetGalley and the publisher. All opinions are my own.