Paul and Sophie escape the room but leave the others trapped when an improvised use of the PREFECT Badges takes them back to the office, while Humphrey’s hidden lock prevents Arthur and Pip from passing through the portable door. The event turns a successful escape into an unfinished rescue: Paul and Sophie recover the door, but the people they promised to free remain behind, and the solution depends on finding two concealed keys.

The badge route out

Mr Tanner’s mum would not tell Paul and Sophie how to leave until they promised to come back for her and the two clerks. Sophie agreed and asked what they had to do. The answer depended on the PREFECT Badges Ricky Wurmtoter had given them: press a badge and call for help, and they would be returned to the office by counter-inversion. The method was described as a simple magical reversal, comparable to retrieving lost car keys, but Paul paused over the destination. Returning to the office, rather than simply stepping out of the room, was a consequential detail.

Sophie was already fumbling for her badge when Paul hesitated. After a long silence, during which Mr Tanner’s mum sat with her head in her hands and the clerks stood embarrassed, Sophie objected that the three of them had no reason to keep Paul and her there. She suggested asking Dietrich Wurmtoter for help or checking the lost-property office at Euston for the missing door. The exchange became an argument between Sophie and Mr Tanner’s mum; Paul tried to interrupt before finally shouting for them to stop. He then announced that he had an idea. The text does not specify the idea itself, but records its result: to Paul’s surprise, it worked.

Return to the office and recovery of the door

The counter-inversion brought Paul and Sophie back to the office, though the journey was distinctly unpleasant. Paul could only compare its sensation to being expelled backwards from a vast divine nostril. Their next passage was no gentler: they were carried through the clouds on Dietrich Wurmtoter’s milk-white winged horse, which flew without needing to be steered. It took them over Birmingham at several times the speed of sound. The horse delivered them onto the platform at Stafford just as a train was arriving.

The timing left little room to act. Paul and Sophie boarded as the train stopped, ran down its corridor, and saw the portable door being pushed into a cleaner’s black plastic sack. Paul hesitated; Sophie snatched the door from the sack, took him by the arm, and dragged him off the train as it pulled away. Their escape had therefore brought them to the object they needed, but recovering it also forced an immediate reckoning between them. On the platform, Sophie demanded to know what the door did. Paul explained, and she was bitterly hurt and offended that he had not told her sooner. Paul had no answer to that hurt, although he knew there was something else he needed to say before they went further.

The failed attempt to bring the others through

After the group had spent a long time waiting, Mr Tanner’s mum said the two clerks had played strip canasta to amuse themselves and hurried them to get moving. She led the way, followed by Arthur and then Pip, who was still struggling with his bootlaces. The attempted return through the door stopped at the threshold: Arthur found himself unable to cross. Mr Tanner’s mum first took his complaint for a joke, then grabbed his elbow with her long, scaly arm and heaved. Arthur yelled, but remained stuck. Pip tried next and was blocked as well.

Mr Tanner’s mum identified the cause as a lock Humphrey had put on the portable door. As she sat down on the station tarmac and burst into tears, the door snapped shut, went limp, and fell off the wall. Paul and Sophie tried to set it up again, but it would not stay in place. When a guard approached with a policeman, they left rather than risk Mr Tanner’s mum disembowelling people in broad daylight. Their departure ended the immediate attempt to free the others: Arthur, Pip, and Mr Tanner’s mum were still on the inaccessible side of the lock, while Paul and Sophie had the door but could not make it work for them.

The two keys and the unfinished rescue

As they walked away from the station, Mr Tanner’s mum explained that the lock worked like an ordinary lock but affected only selected people—the ones Humphrey wanted to keep in—and could not be seen. Paul asked whether it had a key. She said it did, but believed Humphrey had it and would have hidden it somewhere very safe. The obstacle was therefore not merely the fallen door or a failed attempt at counter-inversion: the portable door had been selectively secured against particular people.

The lock required two keys, because the door had two keyholes. Mr Tanner’s mum expected Humphrey to disguise them or make access depend on a test or task, rather than leave straightforward brass keys lying about. She recalled his earlier spell on the hot-drinks machine, which allowed coffee with milk and two sugars only to someone pure in heart—a prankish example of the contrived conditions she associated with his magic. This explanation clarifies why retrieving the door was not enough to complete the rescue. Paul and Sophie had escaped and recovered the means of passage, but their promise to return remained unfulfilled, with two trapped companions and a pair of keys still to locate.