As revenge for marrying a man he didn't approve of, Véronique d'Hergemont's father, Professor Antoine d'Hergemont, kidnapped her baby and, while escaping, drowned with the baby at sea. Fourteen years later, in 1917, Véronique is watching a film and spots her quite unique signature written on the side of a hut in the background of a scene. The signature, V d'H, prompts her to visit the location where the movie was shot and launches her into a deep and ancient mystery that only one man can solve. Arsène Lupin, summoned to provide her with the answers she so desperately craves, discovers that this mission might bring him closer to solving some of the mysteries he has been chasing as well.