"In April and May of last year, there had been so much tension over the merger," said Carole Ghosn, wife of the indicted former auto magnate Carlos Ghosn, who had been pushing Renault and Nissan to merge. "The Japanese were even approaching French government officials. And then in June, it stopped. We know now that it's because the Japanese had figured out Plan B."

"What was Plan B?" I asked.

"To take Carlos down," she said.