Diana Lawrence, a French student from Paris, seeks solace from her hectic academic life by embarking on solo trips a few times a year. Her adventures take her around various cities, granting her the opportunity to unwind, engage in sports, and experience the joy of solitude. This time, her journey brings her to the enchanting city of Prague, where she rents an apartment to bask in the city's charm.

Each day, at the same time, Diana passes by the door of her mysterious downstairs neighbor. Strange and intriguing noises emerge from within, sparking her curiosity. As days go by, she finds herself drawn to the enigmatic happenings behind that door, unable to resist the temptation to uncover the truth.