A very good introduction to CD, DevOps and Agile. It doesn't cover stuff in detail but touches on nearly all important point that anyone needs to have an understanding of.

Be aware that it is written by committed Agile people, so the approach to anyone that dares voice concerns over anything is old and not willing to change (they even cover Change of staff in the book).

All in all, an enjoyable read and recommended if you want some (admittedly technical) understanding of the books topics.