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Arsène Lupin

Lupin moves through Paris as Prince Sernine, André Beauny, or whatever name suits the hour, commanding devoted lieutenants and taunting the Sûreté with letters to the press. Yet the Kesselbach affair unsettles him: he mourns a friend, spares a poet, and catches his own eyes watering at a woman's grief. His vanity, his code, and his hunger for the grand gesture make him both the mystery's engine and its most unreliable narrator.

M. Lenormand

Lenormand is the one policeman Lupin genuinely respects, which is precisely why the prefect and the deputy-chief Weber are content to see him fail. Struck down by illness at the moment the Kesselbach case demands him most, he watches from the margins as the investigation frays into disorder. His feud with Weber and his uneasy intimacy with Lupin's methods make him the story's second intelligence — and its most precarious career.

Rudolf Kesselbach

Kesselbach arrives in Paris chasing a young man named Pierre Leduc and a grand-duchy called Veldenz, carrying a plan he shares with no one — not even the wife he adores. His trust in Dolores is total, inscribed on every gift he gives her, and that trust is what kills him. His death is the novel's first fact and its deepest knot: everything Lupin and Lenormand uncover is really an attempt to read the man's intentions backward.

Dolores Kesselbach

To Paris she is the pitiable Mrs. Kesselbach, prostrate on her sofa, too frail to be questioned; to her accomplices she is Letitia, the joy of Rudolf's life and the author of his death. She moves between the two selves with an actress's discipline, stabbing when discovery threatens and vanishing into her own mourning. Her obsession with Pierre Leduc and the lost throne of Veldenz drives the murders forward — and her brother Altenheim's shadow follows wherever she goes.

Pierre Leduc

Leduc is startled on a Paris street by a man who remembers him from Versailles and informs him, cheerfully, that he belongs body and soul to Arsène Lupin. He is the Pierre Leduc whom Kesselbach was seeking and Dolores was hunting — a claimant to Veldenz, or an impostor, depending on who is speaking. His blank, bewildered presence is the hinge on which the whole conspiracy turns, and he has no idea.

Baron Altenheim

Altenheim operates from a room at the Palace Hotel and a villa in the suburbs, orchestrating kidnappings — old Steinweg snatched from the Palais de Justice itself — with a baron's calm. He is Dolores's brother, bound to her by blood and by the Malreich name, and his loyalty to her costs him everything. His murder removes the one witness who could have explained the family's grievance against Kesselbach, leaving Lupin to reconstruct it from fragments.