Police inspector Karl Brettschneider's love interest who lives with Dr. von Niemann. She discovers his telepathic control over servants, is captured and tied up in his laboratory, and is later rescued.
Their romantic bond becomes endangered when Ruth is captured and Karl confronts Otto.
Ruth Bertin is described as Karl Brettschneider's love interest and lives in the same household while he investigates the deaths.
They share the household and become connected to the investigation through Gussie's discovery of Georgiana's body.
Aunt Gussie Schnappmann is explicitly described as Ruth Bertin's hypochondriac aunt.
Their household association turns into direct hostility when Ruth discovers Otto's secret activities.
Ruth lives in Dr. von Niemann's home, and Otto later ties her up and gags her in his laboratory.
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