While you wait, check out a few sample chapters.

“Just finished reading your book. I have read tons of screenplay books. I couldn't put yours down! Finished it in one day... the pages just flew by - didn't even realize how many pages... concise and clear... Great book, worth every penny!”
Stuart Hyman

“I don't know beans about screenwriting - and I really couldn't care less. But Akers cleverly entertains and enlightens - and earns a place on every reading list. "Your Screenplay Sucks!" should be required reading in corporate offices everywhere (and no, not just Chapter 61.) Put it on your night stand and read it for fun!”
Adam Andrews

Among the many books on screenwriting, William M. Akers' Your Screenplay Sucks! 100 Ways To Make It Great is a clear standout. His hundred ways range from the inspirational to the procedural to the minutely practical, but they are all inordinately useful.  Whatever other books you own on the craft of screenwriting, this one needs to be among them.
Robert Olen Butler, Pulitzer Prize winning author of From Where You Dream