Alan Cowell writing in The New York Times:
[Cordier] had been shocked to see German soldiers photographing one another at the Arc de Triomphe in Paris. But as he headed toward a covert encounter with a fellow operative at a cafe on the Champs Élysées, he was even more stunned to see an old Jewish man and a child with yellow stars on their overcoats.
“The shock of this vision plunges me into an unbearable shame,” he wrote in the memoir, “Alias Caracalla.”
At first he wanted to rush up to the people he saw and embrace them to seek forgiveness, he wrote. At that moment, though, he recognized, walking toward him, the operative he was scheduled to meet. It was an epiphany: “His presence leads me back to reality: I am not in Paris to care for my conscience.”
See also, Wikipedia