Gentlemen of Crime by Arthur Gask

In the meantime a search was proceeding along the Essex coast and the adjoining waterways that was almost epic in its intensity. Untiring and with every faculty strained to the utmost, the detectives had unleashed themselves upon the trail, and as far east as the river Crouch they were exploring every little creek that found its muddy way into the land.

Not only Larose and Naughton Jones, but also Vallon and Raphael Croupin, were there. The great detective of the Surete of Paris had chafed at being left in Norfolk, and finally, a day after receiving the news of McAlbane's death, he had insisted upon participating with the others in their search.