Unfortunately the room we were just at was the cockatrice room, which is a dead-end. Unless you mean the large H-shaped room, where Maloof's hat led us to a secret room?
Maloof will search for a secret door along the north wall, just in case there is another one opposite the existing secret door.
If he finds nothing, let's head north (up the easternmost passage). It seems there is a huge blank block in the NE corner of the map so we might be missing something there.
Let's try the NW then. If it's a dead-end, then try SW. If that's a dead-end too, then try listening at the door which heads west from the SE corridor entering this room. (Unless someone thinks we should pause to check for secret doors at each of the dead-ends first?)