A holiday routine, a minute-by-minute, and a window that won’t stop arguing with the record. Part I rebuilds the night of May 3, 2007 inside Apartment 5A: the Tapas rota and walking routes, who checked and how (listening vs. looking), the ~21:05 visual, the ~21:10–15 lane sighting, the ~21:30–40 listening pass, and the ~22:00 discovery—bedroom window open, shutter raised, one bed empty. We map the search as it ripples from the patio to the lanes and beach, and set the two child-carrying sightings in time and space without jumping to conclusions. No suspects list, no later-years theories—only the geometry of doors, distances, and human clocks under stress, and the disciplined language we’ll carry through the series: what holds, what’s contested, and what the night itself can bear.