The Mark of Cain by Carolyn Wells

A bomb dropped from an aeroplane could scarcely have caused greater excitement among the audience. Every eye in the room followed the tall young figure, as Kane Landon strode to the table behind which the coroner sat. That worthy official looked as if he had suddenly been bereft of all intelligence as well as power of speech. In fact, he sat and looked at the man before him, with such an alarmed expression, that one might almost have thought he was the culprit, and the new witness the accusing judge.

But Mr. Berg pulled himself together, and began his perfunctory questions.