If your answer is 'Three top spade winners,' your vision can be improved! You should see 'Three top spade winners and squeeze possibilities using the ♠2 as a threat card.' Just this one rather ordinary suit should start you dreaming about squeezes.
In this book, learning to recognize and appreciate threat cards plays a central role as you begin to understand how squeeze play operates. It won't be long before you can look at a layout like this one and begin to imagine how the East-West cards will need to lie in order for your squeeze to be successful. Very soon, you will get to the point where simple squeezes are a part of your regular bridge arsenal.
The first edition of this book was named Book of the Year in 2006 by the American Bridge Teachers Association.