Simple English: Idioms is the most simple, concise book to help you master idioms. It is filled with idioms, meanings and example sentences. Plus there is a free Idioms MP3 Pack for you to download so that you can also listen to the idioms as spoken by a native English speaker.
If you want to improve your English by mastering idioms, this book and the Idioms MP3 Pack is for you. Simple, minimal and effective.