- The narrative focuses on the arrival of the "Flying Squad", a police unit specializing in investigating jewel thefts, at Mrs. Vandemeyer's house.
- Inspector Wicks, known as "the Weasel", is in charge of the probe and interrogates Mrs. Vandemeyer, who admits that she hid the stolen emerald necklace in her house before fainting from anxiety.
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- The scene shifts to the library where Inspector Wicks questions Oliver about the emerald necklace.
-Oliver provides an alibi, stating that he was in the conservatory practicing piano, but Wicks remains skeptical and examines his fingers, noticing slight smudges of mud.