This books won't be for everyone. While it definitely tells the overal  story of Lisa's Booby Trap,  it more focuses on the life of her owner and trainer, Tim Snyder. And it's not a pretty life, Tim wasn't necessarily a 'good' man, but the book holds true to his character and his calling to horses and the racetrack. It also follows Lisa through parts of her life too and largely the honest behind-the-scenes of breeding, training and riding race horses. The book tells it all, the rough edges and lows and eventually the fleeting highs.
It doesn't really go into the whole 'reincarnation' story, because honestly that was a media story rather than the belief of Lisa's parents and Tim himself, (they even practically say its rubbish in the book) and the publishers obviously tried to hook onto the fantastical media hyped 'reincarnation' story version as the selling point and blurb, but thats not what the book actual focuses on, so don't expect that going in to it.
But if your interested in horses, the horse racing industry and the honest side of track life, then it's worth the read.