They were in some sort of difficulty and consulted a document without seeming to derive any consolation from it. There was a large map of Rome on the wall: they moved in front of it and searched it anxiously, exchanging baffled glances.

A fresh bevy of tourists moved between these people and Barnaby, and for perhaps two minutes hid them from him. Then a guide arrived and herded the tourists off exposing the strange pair again to Barnaby’s gaze.

They were no longer alone. Mr. Mailer was with them.

His back was turned to Barnaby but there was no doubt about who it was. He was dressed as he had been on that first morning in the Piazza Colonna and there was something about the cut of his jib that was unmistakable.

Barnaby felt an overwhelming disinclination to meet him again. His memory of the Roman night spent under Mr. Mailer’s ciceronage was blurred and confused but specific enough to give him an extremely uneasy impression of having gone much too far. He preferred not to recall it and he positively shuddered at the mere thought of a renewal. Barnaby was not a prig but he did draw a line.

He was about to get up and try a quick getaway through the revolving doors when Mailer made a half turn towards him. He jerked up his newspaper and hoped he had done so in time.

“This is a preposterous situation,” he thought behind his shield. “I don’t know what’s the matter with me. It’s extraordinary. I’ve done nothing really to make me feel like this but in some inexplicable way I do feel—” He searched in his mind for a word and could only produce one that was palpably ridiculous: “contaminated.”

He couldn’t help rather wishing that there was a jalousie in his newspaper through which he could observe Mr. Mailer and the two strangers and he disliked himself for so wishing. It was as if any thought of Mailer involved a kind of furtiveness in himself, and since normally he was direct in his dealings, the reaction was disagreeable to him.