Text: I myself, in company with the police, went to the deceased's room, and whilst there I, apparently accidentally, knocked over the table in question, but found that, as I had expected, Monsieur Hastings had heard no sound at all.
Entailment: I went into the deceased's room and accidentally knocked over the table.
Contradiction: I intentionally knocked over the table, and Monsieur Hastings heard the noise.