She Smelled a Rat
Shortly before Christmas that year, Bourdin went into the bathroom, grabbed a razor, and began to mutilate his face. He was then put in a psychiatric ward for several days of observation. It was after this visit that he wrote in a notebook, “When you fight monsters, be careful that in the process, you do not become one.”

Source: IMDB
Meanwhile, the authorities were starting to doubt Bourdin’s story. Nancy Fisher, an FBI. agent interviewed Bourdin after he arrived in the United States, and immediately she “smelled a rat.” And when she interviewed Beverly, she was “surly and uncooperative.” Fisher Bourdin him to see a forensic psychiatrist in Houston, who concluded that he couldn’t be American, and was most likely French or Spanish.