Deception and Identity

Arsène Lupin constantly adopts disguises and false identities (e.g., as an old half-pay officer, a Russian nobleman, or Horace Velmont), blurring the line between appearance and reality, and using deception as a tool for both crime and justice.

Lupin disguises his intentions and uses a coded signal, while Baron Repstein is accused of assuming a false identity to commit crimes.

Lupin impersonates the working jeweller to swap the ring, and Yvonne's secret love for 'Horace Velmont' is revealed.

Lupin disguises himself as Captain Jeanniot to investigate, and the story involves false claims and trickery among the heirs.

Lupin is trapped through a web of lies and disguises; Mme. Dugrival uses multiple aliases and a fabricated story to ensnare him.