I read this on Kindle Unlimited. There are 10 separate books, but I could read each one in a sitting or two. Being familiar with most of the topics, it was mostly a refresher. Several of the books have nothing to do with "dark" psychology, especially the last book on Emotional Intelligence. The 9th book on Cognitive Behavior Therapy and Dialectical Behavior Therapy, used to help people with anxiety, bipolar personality disorder or other similar conditions, was something I wasn't familiar with.
I found that only a few books were directly on the topic advertised, the information gained by me was good, but the lack of references or bibliography was to me the biggest drawback. I give the overall collection 3.5 stars and recommend it to those who are not experts in these areas.