“I have already made that arrangement,” he said. “Digby——”

“Digby takes up his duty at midnight,” said Manfred. “He has been down to Oberzohn’s place to get the lie of the land: he thought it advisable that he should study the topography in daylight, and I agreed. He might get himself into an awkward tangle if he started exploring the canal bank in the dark hours. Summer or winter, there is usually a mist on the water.”

They reached Frater’s theatre so early that the queues at the pit door were still unadmitted, and Leon suggested that they make a circuit of this rambling house of entertainment. It stood in Shaftesbury Avenue and occupied an island site. On either side two narrow streets flanked the building, whilst the rear formed the third side of a small square, one of which was taken up by a County Council dwelling, mainly occupied by artisans. From the square a long passage-way led to Cranbourn Street; whilst, in addition to the alley which opened just at the back of the theatre, a street ran parallel to Shaftesbury Avenue from Charing Cross Road to Rupert Street.

The theatre itself was one of the best in London, and although it had had a succession of failures, its luck had turned, and the new mystery play was drawing all London.

“That is the stage door,” said Leon—they had reached the square—“and those are emergency exits”—he pointed back the way they had come—“which are utilized at the end of a performance to empty the theatre.”

“Why are you taking such an interest in the theatre itself?” asked Poiccart.

“Because,” said Gonsalez slowly, “I am in agreement with George. We should have found Newton’s car parked in Fitzreeve Gardens—not Oberzohn’s. And the circumstances are a little suspicious.”

The doors of the pit and gallery were open now; the queues were moving slowly to the entrances; and they watched the great building swallow up the devotees of the drama, before they returned to the front of the house.

Cars were beginning to arrive, at first at intervals, but, as the hour of the play’s beginning approached, in a ceaseless line that made a congestion and rendered the traffic police articulate and occasionally unkind. It was short of the half-hour after eight when Manfred saw Oberzohn’s glistening car in the block, and presently it pulled up before the entrance of the theatre. First Joan and then Monty Newton alighted and passed out of view.

Gonsalez thought he had never seen the girl looking quite as radiantly pretty. She had the colouring and the shape of youth, and though the more fastidious might object to her daring toilette, the most cantankerous could not cavil at the pleasing effect.