Unlike Stephen King’s book of the same title, this isn’t exactly “a manual of the craft.” You won’t find much about the writing side of writing here; nothing about crafting sentences, forming paragraphs, developing characters or plots.
It’s less about the craft of writing than about the life of a writer; and it shares with King’s eponym the part-memoir approach. Kennedy spends a lot of time describing how writing has been bad for her health in various ways, and how in turn her pathological fear of flying has made the writing life more difficult, (travelling to North America by ship for a signing tour) for example.
The largest and most entertaining part of it was originally published as blog entries on The Guardian’s site.
It’s very good. And not from the book, but with Doctor Who back (and nearly finished) you should read her meditation on it and on the state of Britain.