There are 4 old books on stands. They contain riddles.  Beside them are 4 stone blocks where the answers to the riddle are placed by rotating the letters. When correctly done the stone blocks lowers to the ground.

Front left book: It can't be seen but it can be heard. It will not speak unless it's spoken to. A picture of a monk talking to 2 men is depicted on the opposite page. Answer is ECHO.
Back left puzzle: The more you take away the larger it grows. A picture of an entryway is seen. Answer is HOLE.
Back right puzzle - Cities without house. Rivers without water. Forests without trees. A picture of a globe is on the opposite page. Answer is MAP.
Front right puzzle - Black when bought. Red when used. Gray when thrown out. A picture of a woman using a bellow is seen. Answer is COAL.

When correctly done, the stone tomb of Marcus Gordon rises.

riddle puzzle 1MAP clueriddle puzzle 2Spell out MAP on the columnriddle puzzle 3COAL clueriddle puzzle 4Spell out COAL on the columnriddle puzzle 5ECHO clueriddle puzzle 6Spell out ECHO on the columnriddle puzzle 7HOLE clueriddle puzzle 8Spell out HOLE on the column