The door they will find themselves in front of will look more impressive than the others, or at the very least like it serves a different purpose. It is locked, and will take brute force to open it, but Percival will be able to get inside using his ability. What he will find is an abandoned workout facility. He needs to exercise caution, because the room itself appears to be both 1) nonfunctional and 2) lacking in gravity.

Additionally, he may run into another Circle Member who appears to be interested in this door as well. Working together would allow the four of you to be able to open the door, if you so choose. Otherwise, Molly and Nott and Percy will be spending a few days trying to pry it open.