Bell started, but his emotion was lost in the darkness. It came as a great surprise to him to find that the enemy was actually in the field. And how apprehensive of danger he must be to come so far with his health in so shattered a condition. Bell smiled to himself as he pictured Henson's face on seeing him once more under that roof.

"How long has Mr. Henson been here?" he asked.

"Only came yesterday, sir. Shall I drive you up to the house? And if you wouldn't mind saying nothing to his lordship about my mistake, sir—"

"Make your mind easy on that score," Bell said, drily. "His lordship shall know nothing whatever about it. On the whole, I had better drive up to the house. How familiar it all looks, to be sure."

A minute later and Bell stood within the walls of the castle.

CHAPTER XXXII

HOW THE SCHEME WORKED OUT

Chris crossed the corridor like one who walks in a dream. She had not enough energy left to be astonished even. Her mind travelled quickly over the events of the past hour, and she began to see the way clear. But how had somebody or other managed to remove the picture? Chris examined the spot on the wall where the Rembrandt had been with the eye of a detective.

That part of the mystery was explained in a moment. A sharp cutting instrument, probably a pair of steel pliers with a lever attachment, had been applied to the head of the four stays, and the flat heads had been pinched off as clean as if they had been string. After that it was merely necessary to remove the frame, and a child could have done the rest.

"How clever I am," Chris told herself, bitterly. "I'm like the astute people who put Chubb locks on Russia leather jewel-cases that anybody could rip open with a sixpenny penknife. And in my conceit I deemed the Rembrandt to be absolutely safe. Now what—what is the game?"