Looking for something to get your synapses firing? This book has fifty-five mind-bending puzzles, each unique and each a challenge in its own right. this is not your run-of-the-mill sudoku or crossword book aimed at helping people kill time in five or ten-minute intervals. Solutions will usually require both a fair bit of time and possibly a little research. Not for those faint of heart, bereft of patience or feeble of mind, this book has no answer key, nor does one exist (as of this writing) except in the author's files. If that seems like too much of an effort, this might not be the book for you... On the other hand, if this sounds like the kind of challenge that fits in your wheelhouse, you will not be disappointed.