George Khalkis - Antiques Dealer Gilbert Sloan - Manager of the Khalkis Collection Collection Tefina Sloan - Khalkis' sister Alan Cheney - Son of Tefina Sloane Dummy - Khalkis' cousin Joan Bright - Khalkis' secretary Jen Freeland - Touring Representative for Khalkis Lucy Freeland - Freeland's wife Albert Grinshaw - Freed Prisoner Dr. Woz - British ophthalmologist Miles Woodruff - Legal Counsel for Khalkis James Knox - millionaire, collector Dr. Duncan Fullerstead - Khalkis' personal physician Jessim O'Dell - Water Works Contractor Lily Odell - Odell's wife

Mrs. Sims - Butler of Khalkis Pepper - Solicitor General Simpson - Attorney General Dr. Samuel Brody - Forensic Assistant Enna Rambo - Handwriting Expert Jimmy - Fingerprint Expert Kygala - Greek translator Thomas Wiley - Detective Inspector Dijuna - servant of the Quinn family Richard Quinn - Police Officer Ellery Quinn - The Constable's Son