“What the hell’s got you?” Mason demanded.

“Can’t you let us into the joke?” Hartwell suggested.

“I really think I must,” Jacob replied, coming to a standstill near the door. “You know, it may seem strange to you, but honestly I am not quite chicken food. I knew a bit about you two, and I should never have come near this dancing class but that I wanted to keep an eye on Miss Bultiwell. Seemed to me yesterday that things were coming pretty well to a crisis. I was the only genuine pupil here—empty house, disappointed adventurers, and all the rest of it. So this morning I looked in at my bank and told them exactly what to do if any open cheque were presented with two little dots underneath my signature. You noticed them, didn’t you, Mason? I should think,” he concluded, glancing at his watch, “that in a matter of five minutes we ought to have some interesting visitors here.”

“The little hound’s done us!” Mason shouted. “Come on, Hartwell. Taxi’s outside. We shall just have time.”

But they faced a transformed and most unexpected Jacob Pratt. Hartwell, rushing for the door, was adroitly tripped up and fell heavily. Mason, after a moment’s whirlwind sparring, found himself on his back, seeing a thousand stars. Jacob took up his position in front of the door.

“Gentlemen,” he announced, “I promised not to attempt to escape and I shall keep my word. But as regards giving you a little lesson, that’s another matter. I might mention that I was knocked out in the semi-finals for the amateur lightweights by a chance blow. You can come along together, if you like, or separately.”

“Rush the little devil!” Hartwell shouted, rising.

They rushed—one another. To their amazed senses, Jacob seemed transformed into some extraordinary creation of india rubber, and the events of the next few minutes lived in their memories only as a hideous and painful nightmare.... In a matter of five minutes, Jacob opened the hall door to Sybil. She stared at him in bewilderment. His hand closed upon her wrist. He held her gently, but there was a feeling of iron underneath the velvet, and a new sternness in his tone.

“The notes are in your handbag, I see. Thank you!”

He thrust the roll into his pocketbook and handed her back the empty bag before she had recovered the power of speech.