Observation
The Archers of Istagon are well known for their exceptional sense of observation, which they use to hit targets at surprisingly long distance. No details escape them, and thus, they are sometimes called upon to investigate the scene of a murder, since they can often find clues others may have missed.
A character with this talent has an improved sense of observation and can detect anomalies of different types when taking the time to observe her surroundings. For example, she is more likely to find a specific person in a large crowd, a book in a large pile or bookcase, or even secret passages. It is important to note, though, that this ability is solely related to sight (which means that if the book is under the pile and completely hidden, this ability will not be helpful - although it may help identify a spot in the pile where some books are hidden).