And forthwith he began to climb, clutching the plank with one hand and the iron ladder with the other.

Jane let him get a good start, and followed.

The ladder was quite easy to climb; it was only when one thought of how immensely far away the skyline had looked, that it seemed as if it would be very uncomfortable to look down instead of up, and to see that horrid little yard equally far below.

Jane did look down once, and everything was black and blurred and shadowy. It was odd to be clinging to the side of a house, with the dark all round one, and the steady roar of the London traffic dulled almost to nothingness.

The night was very still, and a little cold. Somewhere below amongst the tin cans a cat said, “Grrrwoosh,” not loud, but on a softly inquiring note. The inquiry was instantly answered by a long, piercing wail which travelled rapidly over four octaves, and then dwelt with soulful intensity upon an agonising top note.

With a muttered exclamation, Arnold Todhunter dropped his plank. It grazed Jane’s shoulder, and fell among the cats and crockery with a most appalling clatter.

Jane shut her eyes, gripped the ladder desperately, and wondered whether she would fall first and be arrested afterwards, or the other way about. Nothing happened. Apparently the neighbourhood was inured to the bombardment of cats.

After a moment Jane became aware of Arnold’s boots in close proximity to her head. A wave of fury swept away her giddiness, and she began to descend with a rapidity which surprised herself.

Once more they stood in the yard.

Once more Arnold groped for his plank.