This is a well-written little book, and a clear introduction to solving cryptic crosswords. It's unusual in that it is an American book (most cryptic crossword books come from British authors). There is good coverage of all the major clue types, with plenty of examples. After each short chapter there is a mini-crossword featuring just that clue type. There are also progressive cryptics through the book, using the clues learned to that point.
There are 19 full crosswords at the back of the book, and all the answers are explained, another valuable learning tool.
The main thing lacking from the book are some useful reference lists, such as common abbreviations used in cryptics - but these can easily be found in reference books or online.