A much recommended book on Amazon. The first part of the book is quite basic. Use simple words, vary the length of sentences and the like. The momentum picks up in the 2nd part where there is some insightful advice on building character, building tension, and the perennial: showing vs. telling. There is nothing new about the advice but the examples bring it to life. I enjoyed the Part 3 -> handbook on correct use of the language – there were plenty of surprises there.
Recommendation: Read if you are looking for a writing guide.