Train d'Enfer plot
The body of a drowned man is found on the beach of the Côte d'Azur. Antoine Donadieu, who belongs to the French secret service, is in charge of the investigation. Antoine's quest leads him to a house where terrorists led by a German nicknamed "Le professeur" are preparing an attack on an emir from the Middle East. This emir travels by train through Europe. Antoine goes incognito to mingle with the terrorists and soon finds himself faced with the attractive "femme-fatale" Frieda and a plan to blow up a train containing the emir.