I need an important book talking about observation
So when i was reading sherlock holmes stories i noticed that when he meet up with someone he always find that certain spots that tells him something about a person . For example if he met up with someone he will look to him and notice certain something that will lead him to a conclusion about the persons life ,job , personality . U know wat i mean? So ineed a book that talks about certain observation , like it will tell me to look where and conclude the observed thing and maybe get some information about a persons life . It just talks about the “certain spots” like , it gonna tell me if a persons hand looks dry ,Then it maybe bc he washes alot therefore hes so worried about self cleaning . I know its hard to get a book like this but if u have then tell me bellow, but if u have other books that comes in the “observation” subjects then ill accept it too . Just tell me the great great books that really made a change to u