Dip your hand into a silk sack of adjectives and pull out a handful: miserable, exciting, bad, sad, clever, purple, mad, wonderful, gross, dangerous...
Remove the sad and the miserable, and you are left with a description of this mad, bad and dangerous to know book (maybe purple is taking things too far, unless you are inflicted by some weird colour vision defect).
This book is grim reading in the nicest possible way: meaning it doesn't have a happy moment or ending. If you are of a happy, cheerful disposition, then perhaps this book isn't for you; however if you are a bit deeper than that, then this book certainly is.
Read it: it is exciting, clever, wonderful, gross and mad, bad and dangerous to know.