Fire up your fiction by Jodie Renner is one of the best books on editing I've read in my life. Jodie advises to show, not tell and she demonstrates this admirably by showing authors how to correct common mistakes. The book was an eye-opening experience for me.
Sometimes, even when you know you're wrong, you don't know how to correct it. Jodie guides the reader through the elusive process of polishing a book. If you're looking to improve your writing style or tighten your plot, get this book. If you've been told to show, not tell, get this book.
Jodie's experience as an editor shines through in her work. This insight helps new authors who want to self-edit.
On a side note, I find the book works better for thrillers, mysteries and suspense than say, literary fiction or descriptive genres. I would especially recommend it to thriller writers.
Overall, Fire up your fiction is an excellent resources for writers of all ages and genres. Must-have.