I have been wating for something like this. Being a C++ capable person on a 4ish level on a scale from 1-10, and someone who definitely does not watch Youtube tutorials to get into the UE4 C++ API, this book is the entry point to UE4 and C++.
Have been looking around here forever, then in one tiny signature from a UE4 dev, I see a twitter link, then I see the book there.
Advertise yout stuff I could have started 1 1/2 months ago had I only found it!
(I need some sleep