Ask HN: What can I read to learn about ADHD?

In the last few years the online discourse around ADHD is very confusing. I have seen nearly every possible symptom attributed to it. I have seen numerous accounts of complete opposite symptoms attributed to it. I've seen increasing accounts of symptoms that seem to have nothing to do with executive disfunction, such as time blindness, chronic fatigue, and sensitivity to criticism. I am at the point where I don't think I understand what ADHD is or how it could present. It seems as though almost any disfunction could be explained by ADHD, if I cite Reddit et al.

I've also heard conflicting statements of fact. Stimulants affect sufferers differently from non-sufferers; stimulants affect them the same; it causes inability to focus; it causes hyper focus; it is inherent; it is caused (by various claims, like too many shorts).

What book can I read that is a scientifically supported account of ADHD? I want to know the truth of the matter. And from what I understand the truth of the matter is somewhat contentious; I would also like to read a scientifically supported, though not fully accepted, counterpoint.