This Hitman 3 game guide video shows how to unlock the hidden safe in the Thornbridge Manor in Dartmoor, England. You need to reach Alexa Carlisle’s office which is located on level 2. Approach the big desk and activate the button on the big chair to reveal the safe behind the painting. The clues to opening the safe are the four icons above it. Find the objects from the icons. There’s going to be a number next to each object. The code to opening the safe is 1975. Unlocking the safe will allow you to collect Case File on Arthur Edwards (it’s one of the mission’s main objectives, however taking the documents from the safe isn’t the only way to get the case file).
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