Lerch has written an enormously useful book worth far more than its cost, but only to a certain set of apprentice screenwriters.
In contrast to a reviewer who said this book would be most helpful for beginners, I think the book is most helpful for non-beginners. Indeed, I think the negative reviews on the book owe to the fact that the book takes for granted the reader is knowledgable about the nature of "story." Not just the story of screenplays, but the nature of general story, whether in the form of short stories, novels, plays, or even song.
For someone not terribly familiar with the nature of story, this book will seem like a waste of their time, or, worse, a theft of their money. For it is not written in narrative. It is an enumeration of 500 "ways" that Lerch offers on the craft of screenwriting. A beginner will definitely be disappointed.
However, for someone knowledgable about story who is interested in learning about screenwriting (or even more fitting, someone, such as myself, who is a fiction writer aiming to convert to screenwriter), I haven't seen a better book on the shelves, and I have been looking.
When I read it, I used a third of a notebook taking notes. Some points she makes could quite literally save someone's entire dreams of screenwriting. For instance, did you know when a Hollywood reader receives a script with an address outside L.A. the script is essentially dismissed as the work of an amateur? (Out-of-staters have to rent an L.A. P.O. Box.) Cruel? Perhaps. But important to know for the apprentice screenwriter? Without doubt. Just that point alone for someone outside L.A. would be worth the $12.
The book abounds in points of equally great importance, whether they be on character, on formatting, or on the nature of "The Biz."
One final comment. Perhaps the most impressive part of the book is Lerch's authority. As the book states, she's been a reader in Hollywood for more than ten years, eight of them at William Morris. For those who don't know, in Hollywood, William Morris is just about the Holy Grail. Stories are legion of movie moguls beginning their careers in the William Morris mail room. (David Geffin began his career there.)
Thus, if you're an apprentice screenwriter knowledgable about story and want to learn the ins and outs of the craft of screenwriting, I doubt you'll find a more useful or authoritative book. If you're a beginner, this isn't the book for you.
Because I've found this book singularly helpful, if anyone has anyone questions about the book, I'd be happy to offer my thoughts. Or you can e-mail the author herself, as she gives out her e-mail address in the book. I wrote her with a question and she promptly responded with an answer.
Good luck and good writing all.