The Nine Unknown by Talbot Mundy

In one hot brick cell, closed by an iron door with a peep-hole in it, there were three of the sons of Sikunderam, one Hindu in orange-yellow with a crimson caste-mark on his forehead, who had refused his name, and Fernandez de Mendoza de Sousa Diomed Braganza, whose name and occupation were as well known as his temper was notorious and his predicament acute.

None of the others seemed to worry much. The "sons" were aware that father Ali and his patrons knew their whereabouts, and it is Law in the North, whence they came, that the feudal claims are first. There would either be a rescue, or a use of influence, or possibly raw bribery this side of midnight. They were sure of that, whether rightly or wrongly.