"File No. 113" by Émile Gaboriau is a gripping detective novel set in Paris, revolving around a significant bank robbery at the Fauvel banking house. The story begins with the discovery of a theft of 350,000 francs from a supposedly impregnable safe. The prime suspect is Prosper Bertomy, the bank's head cashier, who is accused of the crime due to his exclusive access to the safe. Despite the overwhelming evidence against him, Prosper maintains his innocence, claiming that he did not commit the theft. The narrative unfolds as the police, led by a skeptical commissary and the ambitious detective Fanferlot, delve into the mystery to uncover the truth. Fanferlot, known as "the Squirrel" for his agility, is determined to solve the case and make a name for himself. He suspects a deeper conspiracy involving the bank's owner, M. Fauvel, and possibly others. As the investigation progresses, personal relationships and hidden motives come to light, complicating the case further. Prosper's past, his connections, and his interactions with M. Fauvel's niece, Madeleine, add layers to the mystery. The novel explores themes of trust, betrayal, and the pursuit of justice, as the characters navigate through a web of deceit and intrigue. Gaboriau masterfully combines elements of suspense and drama, keeping readers engaged as they follow the twists and turns of the investigation.