"813" by Maurice Leblanc is a suspenseful detective novel written in the early 20th century. The story revolves around the enigmatic character Arsène Lupin, a gentleman burglar, as he engages in a thrilling game of cat and mouse with the authorities after committing a series of crimes, including a shocking murder. The novel introduces readers to a high-stakes world of intrigue, where Kesselbach, a wealthy man, becomes embroiled in a plot that threatens not only his life but also his ambitions. The opening of "813" sets a tense atmosphere with Mr. Kesselbach discovering that someone has invaded his hotel suite while he was away. Anxious and paranoid, he discusses strange occurrences with his secretary, Chapman, pointing out the peculiarities in their situation. When the mysterious Arsène Lupin makes his dramatic entrance, the tension escalates to a confrontation filled with twists and a daring heist, leaving readers breathless and eager to uncover the secrets surrounding Kesselbach's wealth and ambitions, as well as Lupin's true motives. (This is an automatically generated summary.)