813

In the elegant Palace Hotel, the wealthy and enigmatic Rudolf Kesselbach settles into a luxurious suite, only to discover that objects have been moved and a mysterious presence seems to have slipped in while he dined. His uneasy secretary, Chapman, insists there is no way anyone could have entered, yet Kesselbach’s growing dread drives him to summon the renowned detective M. Lenormand. The early scenes weave a tense cat‑and‑mouse atmosphere, as the detective races against time to uncover a hidden intruder in a space that appears sealed from the outside.

As Lenormand begins his methodical investigation, the story unfurls a subtle web of clues—locked doors, missing keys, and a shadowy figure whose motives are as elusive as the hotel’s polished corridors. The narrative balances high‑society glamour with the quiet suspense of a theft that feels almost impossible, inviting listeners to piece together the puzzle alongside the seasoned sleuth.