This was what he saw.

In the walled garden below, the secret garden of the palace, stood the queen Neter-Tua, and the sunlight piercing through the boughs of a flowering tree, fell in bright bars upon her beauty.

She was not alone, for before her knelt a man wearing the rich robes of a noble.
Kaku knew him at once, for although still young, he was Abi's favourite captain, an officer whom he loved, and had raised to high place because of his wit and valour, having given him one of his daughters in marriage.

Also he had played a chief part in the great plot against Pharaoh, and it was he who had dealt the death-blow to Mermes, the husband of the lady Asti.
Now he was playing another part, namely that of lover to the Queen, for he clasped the hem of her robe in his hands, and kissed it with his lips, and pleaded with her passionately.

They could catch some of his words.
He had risked his life to climb the wall.