Summary Drago, manager for world famous violin virtuoso, Pietro Ascoli, arranges to have the violinist's highly insured Stradivarius stolen. Drago plans to have Ascoli pay a ransom for the return of the violin, but when Ascoli tries to use the insurance money to buy the instrument from the thieves, Robin prevents him, and in doing so is attacked and captured by the thieves. With the help of Phyllis, Robin gets away, only to find that in his absence Drago has paid over a huge sum to the thieves and been given a worthless copy of the valuable Stradivarius. Being now suspicious of the tricky manager, Robin and Phyllis plant a trap into which Drago walks, revealing the whereabouts of the manager's accomplices, the stolen violin, and the ransom money. After a fast-moving skirmish with the thieves, Robin recovers both the violin and the money.

• Crime
• Drama
• Mystery