Professor Moreau's diary

In the Blood and Wine expansion to The Witcher 3: Wild Hunt, the charred, yet partly legible remains of Professor Moreau's diary can be found en route to his abandoned laboratory beneath the flooded ruins of the Valley of the Nine.

Content
''(...) Since certain suspicious individuals have begun hanging around outside my laboratory, I have been forced to implement additional security measures. I suspect they are but common criminals looking for something shiny to steal and have no real interest in my research, but better safe than sorry.''

[illegible fragment]

''...furthermore, on the advice of an engineer acquaintance of mine, I have decided to secure the premises with a simple mechanical apparatus. In one of the rooms along the route to the laboratory, I have installed a mechanism for locking and unlocking the doors which is operated by pressing four protruding stones placed high up on the walls. I can bypass this lock with a simple spell, but a common thief will be faced with a double challenge – first he must notice these stones and puzzle out their purpose, then, he must find a way to press them...''

[illegible fragment]

Associated quest

 * Turn and Face the Strange