Puzzle in the hidden lair (Marodino`s lab)

[Make or take]

there supposed to be a puzzle after you killing the giant flower thingy called Rafflesia abominabla, i can only find 4 switches under the tree so far, tried to put my party members on em, but nothing happened, any1 solved this yet ? could really use some helps here, thanks in advance.

[Duck Whitman]

Oh, I just got here.

[?!]

nope, why we get here for at all? mean what need to find there the chamber closed

[Phantom]

Drop weights on the four switches then in his lair is a plain book, read that and it opens

[?!]

Originally posted by Phantom:

Drop weights on the four switches then in his lair is a plain book, read that and it opens

i knew about book but - that book i sold somewhere
switches just open metal door, which no need to open

[Nneem]

I really had a hard time finding how to open the stone door in Maradino's Lair. When I read comments on forums it said to read a book, so I read pretty much every book in my inventory in that room, but nothing happened. Oh well, I wish someone would have commented that the book you need is not one you pick up, it's just one you need to click on in the room. I hope someone sees this and is spared the trouble. Btw, the switches by the plant do not seem to matter at all.