it is on top of the vault
On The Spy Island!
To open the vent on the house on Toupee Terrace you need the Laser pen. You get it from the First Spy rescued at the Docks, The spy on Toupee Terrace is the Second Spy. (see related question)
The kitchen vent in the Bistro, just jump up. The vent atop the electrified building has bars on it. You will need to get the Laser Pen by rescuing the First Spy on the docks.
you click on it and you will use the laser pen
In the kitchen you have to jump to the ceiling and go through the vent until you reach the door.
you have to find an air vent and go threw it1
The tallest building on Balding Avenue. It is where the third spy is held. (see related question)
its easy just google the thing u want to find
You have to free the "first" spy, at the Docks, before you can rescue the "second" spy, who is in the attic behind the bars. The first spy will give you a Laser Pen that can cut the bars. (see related question)
go through the vent
you go to the kitchen and jump up until u see a vent go in the vent and then there will be lights jump on the lights till there are no more
You have to rescue them in order, because the first two give you items that you need to rescue the next spy. (see the related questions below)