Case summary
The corridor camera for the ninth floor has been running since 2011. It was replaced in March and the footage between 21:00 and 06:00 was overwritten by a loop. The card reader logs are intact.
A neighbour in 906 reported someone using the service stair at approximately 00:20. She heard two sets of footsteps going down and one coming up.
Key card 9041 used at the west lift. Nobody exits.
Room service brings a coffee to 903. The trolley is returned empty, 22:52.
Subject seen by the night porter at the west corridor, without the holdall.
Witness 903/906 reports footsteps in the service stair. Two down, one up.
Room found empty. Window closed. Heater on. Ashtray contains one stub, still warm.