Robin was trembling from head to foot. He drew a quivering breath between his teeth, and stood silent.
"Tell me why!" Green insisted.
Robin locked his working hands together. Green waited.
"It—it—I didn't see—Mrs. Fielding," he blurted forth at last.
Green made a slight movement that might have indicated relief, but his tone was as uncompromising as before as he said, "That's not an answer to my question. I asked you why you did it."
Robin shrank from the curt directness of his speech. His defiance wilted visibly. "I—didn't mean to break the window, Dicky," he said, twisting and cracking his fingers in rising agitation.
"What did you mean to do?" said Green.
Robin stood silent again.
"Are you going to answer me?" Green said, after a pause.
Robin made a great effort. He parted his straining hands and rested them upon the table behind which Green sat. Standing so, he glowered down into his brother's grim face with something of menace in his own.