'For one so quick-witted, you are singularly stupid,' remarked the lady, with a touch of the imperiousness that reminded Marion of the personage she had first known and feared. 'I must stay here to cover your sudden departure with the lad. No, leave my comings and goings to me, my fair general. See you to your own and Roger's. Simone and I will follow you to Garth.'

Marion rose and bade her aunt good-night without any further argument, and accompanied by Simone stole along the gallery to the little chamber under the eaves. The moon was breaking from a bank of golden haze in the eastern sky as Marion gently put back the shutter and peered out. The silence of the night lay about the garden, and save for one lighted niche the gaol was in darkness. As Marion had surmised, Roger was playing his part in the game whose nature he could only guess. A candle stood on his table, which he had drawn out of vision so that its flame should not blind the eyes of the watcher to the disposition of the room. He himself, sitting at the table, reading, was partly visible to Marion's eager eyes. But what she had longed to see, and was comforted to behold, was the end of the plank bed half way along the bare wall. She had been secretly haunted by the possibility that her arrow might alight on the sleeper, should he be sleeping. The corner of the room which was her target was empty.

Cautiously Marion withdrew her head. The heavy footsteps of the unseen sentry sounded, making the corner of the buildings. Like his comrade during the day, he steadily patrolled the wide stretch of yard, coming from time to time round the gable end to take in the narrow patch at the south front of the gaol. Knowing that soon the moon must lie full both on that side of the prison and on the little eastward casement, and fearing the eyes of the sentry, Marion half closed the little shutter. There was a sharp creak she could not avoid, and watching through the crack she saw that Roger had heard the noise. He rose and looked upward through his bars. Then, either fearful of the sentry's comments on his candle, or, as Marion guessed, content that he had been seen, he put out the light just as the sentry turned the corner.

Marion watched the dark form of the sentry as he walked the length of the building, turned, and heavily stamped back. He disappeared; presently the measured beat was heard in the yard beyond. A minute later the moon swung clear of the curtain of haze.

More cautiously this time Marion moved the shutter back, then thrust out her head in the clear light. Immediately a hand stole from between the bars across the way, and waved a stealthy greeting. Marion raised her own hand and pointed to the moon. Her finger travelled in a mimic motion of the moon crossing the sky, once—twice. Then swiftly she gave the gesture of warning which she had mentioned to her aunt. She repeated the motion. The hand across made the signal of assent. Then, greatly daring, after a rapid survey of the gaol yard where the invisible sentry was still tramping, Marion gave in dumb show the action of shooting an arrow.

The moon was full on her face as she moved. Simone caught her breath. There were other cells in the south front of the gaol: other eyes might well be watching the little play. The hand across waved again. In the gloom of the building Roger's face, a white patch crossed by the bars, was clearly visible. The sound of the sentry came nearer. Again Marion closed the shutter.

'He understood,' she whispered. 'He nodded. Did you see?'

Simone gripped her arm. 'Come away, Mademoiselle. Do not attempt to look again. The moon is on this window as clear as day. I am afraid. There may be other eyes yonder, as well as Master Roger's.

'Not so,' replied her companion. 'But we will go now. 'Tis better, perhaps.'

The two crept back along the passage to Marion's chamber. In the light of the sconces Simone looked anxiously at her mistress. Marion smiled.