Monstrum Crime Scene - Secret Basement to Level End
Descend these stairs to a SECRET ROOM IN THE BASEMENT. Examine the display cases. Three of them yield more information about the Periapt Shards and the Cubiculum Nephili. (Your notebook is updated (45/62) with the Latin inscription, "TRES PERIAPTI CONIUNCTI CUM IUSTITIAE IGNE MALA CINGUNT," and its English translation, "The three Periapts joined together burn with righteous light to confine evil.") The fourth case has what looks like a Star Wars Battle Droid head but no useful info.
Pick up the Vasiley Full Fax (4) from the floor near the desk. Examine it in your inventory to find a secret code: 31597.
NOTE: As far as I know, the website mentioned in the fax, shadowwhistories.pr, does not exist and didn't at the time the game was released. Angel of Darkness writer Murti Schofield's website does include a section on his series of novels, The Shadow Histories.
Use the code at the keypad behind the desk to open the secret compartment behind the painting. Take the LAST OBSCURA ENGRAVING (5).
Return upstairs...
...and exit through the door to the right of the grandfather clock.
In a brief cutscene, Lara discovers Bouchard has vanished. Go into the hall and turn left.
Open the closet door ahead on the left. In another short cutscene, Bouchard's body tumbles out.
Search near his body for the CELLAR KEY (6). Continue to the end of the hall and down the stairs to the the CELLAR.
Cross the room and go through the red door, which opens now that you have the key.
If you left the dog alive earlier for the "Good Boys" achievement/trophy, he may be lurking outside now. So I'd recommend saving before exiting the building.
Another notebook entry (46/62) unlocks as you emerge: "Get Strahov entry code from Luddick." Conveniently, he's waiting just outside.
If you don't see the dog, just run to the journalist and initiate dialogue before the dog notices Lara. If the dog is in your way, try luring it down the cellar steps.
Then quickly climb up out of its way.
Once the dog comes down the stairs, it should be stuck there. Or, if all else fails, you can lead the dog around the block and sprint back to Luddick.
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