Where is the secret room in Marburg's Garden?

[johnathan]

Where is the secret room in Marburg's Garden? I want to know it because I want to get 83% dossier about Marburg so I can kill him and get his pistol.

 

It is good if anyone can upload a picture about the secret room or tell me how to get to the secret room .

[Grand_Commander13]

It's right at the exit. There's a garden hose on the right side. Can't miss it (it's so obvious I checked it for a secret door on my first playthrough).

 

Mike can only find it if he bought the map of the villa before the mission though.

[Tigranes]

Buy a map before the mission. Final area of the mission, a hidden door in the garden area that you can now see in the map.