“There’s no knowing what blunders you youngsters will make,” he rumbled, sotto voce.

They reached the library door in time to see Isabelle join a stiff and wooden company. At sight of them Anita jumped to her feet, her dark eyes sparkling with anger.

“Would you mind telling me,” she demanded of Landis, “how long you propose to keep us here?”

“Not a moment longer than is necessary!” Landis broke off at a touch on his arm. Bernard nodded toward the finger-print expert just emerging from the dining-room.

“Just a minute, please, Miss Harrison,” said Landis. He turned calmly to face the expert while Anita waited, fuming, and tapping a small foot on the polished floor.

“There’s not a sign of a finger-print on the bow nor the arrows either, Lieutenant,” the man announced. “Looks as if they’ve been carefully wiped. There ought to be some finger-prints on almost any hard surface in a house.”

“Too bad,” nodded Landis. “Well, see what you can find on the armor and on the door at the end of the library here. You can have the place to yourself now.”

“Very good. You want pictures, too, don’t you?”

“Yes. I want the armor with the bow as we found it, the entire library from that end of the room and the reception-room with Harrison’s body. But those can wait a bit.”