# Doctor Von Blon — The Greene Murder Case character guide > Doctor Von Blon in The Greene Murder Case by S. S. Van Dine. **Role:** supporting **Also known as:** Von Blon, Doctor Von, Blon **First appearance:** 0006-iii-at-the-greene-mansion ## Who they are The Greene family physician, whose pleasant bedside manner and unhurried access to every room make him both comfort and quiet question mark. ## Relationships ### [Philo Vance](https://www.betterreads.dev/discover/the_greene_murder_case_se/characters/philo_vance) _professional_ Von Blon cooperates with Vance as the family physician, providing medical insights while maintaining a cautious distance. ### [Chester Greene](https://www.betterreads.dev/discover/the_greene_murder_case_se/characters/chester_greene) _social_ Chester and Von Blon are acquaintances through the Greene household, with Chester often dismissive of the doctor. ### [Ada Greene](https://www.betterreads.dev/discover/the_greene_murder_case_se/characters/ada_greene) _friendship_ Ada has a cordial, trusting relationship with Von Blon, who cares for her health and well-being. ### [Sibella Greene](https://www.betterreads.dev/discover/the_greene_murder_case_se/characters/sibella_greene) _professional_ Von Blon attends to Sibella as her physician, but their interactions are marked by her coldness and his wariness. ### [Ernest Heath](https://www.betterreads.dev/discover/the_greene_murder_case_se/characters/ernest_heath) _professional_ Von Blon and Heath interact as professionals, sharing information about the case with mutual respect. ### [Philo Vance](https://www.betterreads.dev/discover/the_greene_murder_case_se/characters/philo_vance) _professional_ Von Blon cooperates with Vance as the family physician, providing medical insights while maintaining a cautious distance. ### [Ada Greene](https://www.betterreads.dev/discover/the_greene_murder_case_se/characters/ada_greene) _friendship_ Ada has a cordial, trusting relationship with Von Blon, who cares for her health and well-being. ### [Ernest Heath](https://www.betterreads.dev/discover/the_greene_murder_case_se/characters/ernest_heath) _professional_ Von Blon and Heath interact as professionals, sharing information about the case with mutual respect. ### [Ernest Heath](https://www.betterreads.dev/discover/the_greene_murder_case_se/characters/ernest_heath) _professional_ Von Blon and Heath interact as professionals, sharing information about the case with mutual respect. ### [Sibella Greene](https://www.betterreads.dev/discover/the_greene_murder_case_se/characters/sibella_greene) _professional_ Von Blon attends to Sibella as her physician, but their interactions are marked by her coldness and his wariness. ### [Chester Greene](https://www.betterreads.dev/discover/the_greene_murder_case_se/characters/chester_greene) _social_ Chester and Von Blon are acquaintances through the Greene household, with Chester often dismissive of the doctor. ### [Chester Greene](https://www.betterreads.dev/discover/the_greene_murder_case_se/characters/chester_greene) _social_ Chester and Von Blon are acquaintances through the Greene household, with Chester often dismissive of the doctor. ## In the story ### [V: Homicidal Possibilities](https://www.betterreads.dev/discover/the_greene_murder_case_se/chapters/v-homicidal-possibilities) Von Blon enters the drawing-room and reports on Ada's condition, stating she is recovering from shock and blood loss and may be questioned soon. His manner is suave and reserved, and he treats Sibella with casual cordiality. ### [VI: An Accusation](https://www.betterreads.dev/discover/the_greene_murder_case_se/chapters/vi-an-accusation) Attends Ada, reassures her, and sharply rebukes Sibella for her outburst. ### [A Painful Interview](https://www.betterreads.dev/discover/the_greene_murder_case_se/chapters/xi-a-painful-interview) Calms Rex with luminal, defends Rex's innocence, and recalls a camping trip with Chester Greene where a revolver was used. ### [A Motor Ride](https://www.betterreads.dev/discover/the_greene_murder_case_se/chapters/xii-a-motor-ride) Accompanies Sibella and Ada on the drive; shows displeasure when Vance joins. His relationship with the family continues to intrigue Vance. ### [XIV: Footprints on the Carpet](https://www.betterreads.dev/discover/the_greene_murder_case_se/chapters/xiv-footprints-on-the-carpet) Arrived at the house earlier; was in Sibella's room when the shot was fired; confirms the wound matches the previous murders. ### [XV: The Murderer in the House](https://www.betterreads.dev/discover/the_greene_murder_case_se/chapters/xv-the-murderer-in-the-house) Provides alibi for Sibella, stating he was in her room from before 11:00 until called by Sproot. Approves plan to replace the nurse with a police plant. ### [The Lost Poisons](https://www.betterreads.dev/discover/the_greene_murder_case_se/chapters/xvi-the-lost-poisons) Reports to Markham that morphine and strychnine were stolen from his medical case while he was at the Greene house. ### [Two Wills](https://www.betterreads.dev/discover/the_greene_murder_case_se/chapters/xvii-two-wills) His satchel of poisons (morphine and strychnine) was stolen from the Greene mansion's upper hall shortly after Rex's murder, as reported by Markham. ### [XVIII: In the Locked Library](https://www.betterreads.dev/discover/the_greene_murder_case_se/chapters/xviii-in-the-locked-library) Visits the Greene house, appears upset about the stolen drugs, and spends time with Sibella. ### [XIX: Sherry and Paralysis](https://www.betterreads.dev/discover/the_greene_murder_case_se/chapters/xix-sherry-and-paralysis) Defends his diagnosis of Mrs. Greene's paralysis; discusses medical texts and agrees to arrange an expert report. ### [XXIII: The Missing Fact](https://www.betterreads.dev/discover/the_greene_murder_case_se/chapters/xxiii-the-missing-fact) Identified as the man who secretly married Sibella Greene a year prior. ### [Endnotes](https://www.betterreads.dev/discover/the_greene_murder_case_se/chapters/endnotes) Noted as an amateur photographer who used cyanide tablets, and who later discovered one missing. ## Links - HTML: https://www.betterreads.dev/discover/the_greene_murder_case_se/characters/doctor_von_blon - Book: https://www.betterreads.dev/discover/the_greene_murder_case_se - All characters: https://www.betterreads.dev/discover/the_greene_murder_case_se/characters