"Sabotaged props. Remove a vital component and voilà. The murder occurs of its own accord. Painless and simple enough for even one in her position. And afterwards, easy enough to call it 'accident' or 'mishandling'."

He shrugs.

"It is quite ingenious, if she had not been hare-brained enough to watch her work in full view of the witnesses. Messieurs Tic & Tac are being prepared for the trial tomorrow by the prosecution. They will have time to see no one tonight."