1953 Perry Mason

The Case of the Green-Eyed Sister

Client Sylvia Bain
Victim J. J. Fritch
Prosecution Hamilton Burger
Investigator Paul Drake / Lt. Arthur Tragg

Case Narrative & Plot Summary

Blackmail recordings made on wire dictating machines threaten a prominent family, culminating in a murder where the tape seems to capture the shot.

Courtroom Cross-Examination & Forensic Trick

Mason analyzes magnetic wire recording frequency responses to prove the audio tape was spliced.