RON RANDELL and ALAN MOBRAY are the unfortunate replacements for The Lone Wolf and his faithful valet Jamison. Given the material, they do respectful work but none of it has much effect or can overcome the weak plot, all too familiar by this time.
JUNE VINCENT is the newspaper woman who gets to spout some snappy dialog in all of her confrontations with the newspaper boss, the police and Michael Lanyard, the Lone Wolf. WILLIAM FRAWLEY is a police inspector and DOUGLAS DUMBRILLE is an agitated newspaper publisher. STEVEN GERAY is a kidnapped diamond cutter.
She invites Lanyard to attend the opening of an exhibit featuring the unveiling of the world's third largest diamond, the Tahara Diamond. Naturally the jewels are stolen during a well planned robbery and Inspector Crane immediately suspects Lanyard of being the thief.
For devotees of the series, this one has all the familiar elements without any new twists. It's passable, but easily forgotten.