3,5/5. I have mix felling about this one. The first half deserve a five out of five stars. It starts explaining what is OCD, gives examples and try to explain how the brain of those persons works. This part was really interesting for me, having some anxiety issue for a long time and even some very light OCD traits, it help understand that we are not alone and hoe and why we might be this way. The second half was more about treatment, therapy, pills, surgery which was well done but not as useful and interesting from a personal point of view because I'm not there myself, but still, like I said, well explain and present. So I'll go with a 3,5 out of 5. If you're having trouble with OCD or living with someone who live with it, it really help understand and also can help finding solution. Not a perfect book, but sure is a pretty decent one on a subject that isn't much talked about.