you find a bush or a hole in the wall and get a Pokemon who knows secret power. then use secret power on the hole in the wall or bush and it will make a hole. you can go in and make your hideout.
Well, Nancy Drew is a fictitious character. I believe you are referring to the house in the 2007 movie with the passageway. That was not her house and there is no secret passage in her home.
most likely rocks and a secret passage way.
Get a log
I don't think there is a secret passage way on Club penguin because all the available places on Club penguin for members and non members have been discovered and are on the map.
You have to get in detension
in the detention room
there's a case that's magnetic, you need the magnet thing and get it out, just walk near it and then you'll drop into the secret passage.
look for it around the dojo.
get the bell clapper
well thats where you on the passage idk what to do with the stone but i konw thats the seceret passage on fantage sorry go on youtube!
Go all the way to bottom left and spin attack [x] the wall. And when you get to the secret passage, remember spin attack is your friend.
The secret passage way in Deception Island is under one of the tables in the back party room in the cafe. The table is close to the wall and it is the one with the salt and pepper shakers knocked down.