that it was not the ambassador's bag that was important. Rather, a different bag was in the ambassador's possession for an hour or two, thereby bypassing customs for reasons of diplomatic immunity. Tommy delayed their arrival at the parlour to give Tuppence and the police time to get there first. They search the premises and find tins of bath salts which contain cocaine. The Man Who Was No. 16 Mr Carter congratulates the Beresfords on their successes at the agency, but he gives them a warning that Moscow has become suspicious of the failure to hear from their agents, and that they have despatched a man to investigate. The agent is known to them, having caused them problems in the past, but he is master of disguise and linguistics. He is also the deviser of the "No. 16" code and they expect him to turn up at Blunt's – although he has never met the real Theodore Blunt and doesn't know that Tommy has been impersonating him. The Beresfords are given other known codes to watch out for and are asked to co-operate as much as they can with "No. 16" to help Carter get to him. The two go back to the agency where they find that too many leaves have been torn from a calendar so that it now shows the date as Sunday the sixteenth, which is six days hence. Albert tells them that could only have been done by a client who waited for some time for them that morning – a hospital nurse. After a short while, another client is shown in – a fair, bearded man who goes by the name of Prince Vladiroffsky, and who starts to use the codes communicated to them by Mr Carter. Upon being questioned, the Beresfords tell him that treachery is afoot. "No. 16" assumes that Tuppence is an agent known as "Marise" and suggests that she lunch with him at the Blitz hotel, and that they then meet Tommy later on at Headquarters. They leave and Tommy communicates with Mr Carter, whose men have been listening in to the conversation in the office. Going to the Blitz, the "Prince" and Tuppence dine, served by waiters, some of whom are policemen in disguise. They then go up in the lifts to the "Prince"'s suite, but when they fail to appear some time later, the lift man tells Tommy