One of the best Doctor Who books I've read so far, full of paradoxes and ramifications ( nice word, ramifications...), not to mention the blinovitch limitation effect. Great emotional story too. If you had a chance to go back in time to change things, would you do It? But what could happen? If you're a fan of Doctor Who or like time travel stories, this book is for you.
The world of the Doctor in the eyes of Douglas Adams. A Priceless experience. I highly recommend It.