Identity and Disguise

The book revolves around characters adopting false identities, such as Don Luis Perenna being revealed as Arsène Lupin, and the villain's ability to appear as different people, highlighting the theme of deception and the fluidity of identity.

Don Luis's identity is meticulously verified, yet his past nickname 'Arsène Lupin' and his mysterious captivity hint at hidden layers and a dual persona.

Perenna reveals his true identity as Arsène Lupin, yet maintains the disguise of being 'dead' to evade the law.

Perenna's hidden identity as Arsène Lupin and the question of who is truly responsible for the crime underscore themes of deception and mistaken identity.

The public and press debate whether Don Luis Perenna is actually Arsène Lupin, highlighting themes of hidden identity and disguise.