Ideas for RPG Games #6 Found in an Old Book

http://www.wizards.com/default.asp?x=dnd/ebsh/20040927a

The Blank Codex

The uncle of one of the PCs dies and leaves his adventuring nephew or niece a curious old codex bound in leather and locked with a keycharm(Shadows of the Last War, pg. 24). The cover has no title but is decorated with circular sigils. When they get it open, its pages are blank -- yet the book radiates magic! It turns out that each page is written with a special kind ofillusory script: unreadable unless certain conditions are met. Some of the pages are time-based: one becomes readable when the plane of Dolurrh is waxing, for example. Others are based on characteristics of the reader: only elves or those with the Mark of Handling can read certain pages.

What can be read there? The book is the journal of a wizard and Last War veteran in the uncle's family (the wizard's arcane mark is probably on it somewhere). The wizard traveled extensively and saw many wonders and mysteries, making the book a gold mine of potential adventures. Now that it has emerged, the book may also draw attention to the heroes. A representative of House Sivis would pay handsomely for such a work of scribing; enemies of the old wizard may try to steal it; and an obsessed cultist who believes it may contain a map to a protected seal may threaten or kill the heroes for it.

IDEA 1#

investigating a crime where a group of people do some weird things like collecting items like pigeon feathers, 
pixie wings, giant eagle feathers, and unicorn horns,making tall trees to fall .

IDEA 2# 

A Book inside an old building that is hidden in a secret place where there is a magical book its pages talks about specific things that will happen in the future a day after the date written on the page

IDEA#3

An expedition of an adventurer archaelogist who is going out on a trip where he is following some clues and the whereabout of some hidden treasures in the dungeon

IDEA#4

Two Monsters have been locked up in a Tower Castle and your mission is to trick them and try to get them out of the Tower alive and you will be generously rewarded.