The Battersea Park Road to Enlightenment by Isabel Losada
This book is a little different to the majority of recommendations usually given here. It is not really a self improvement book per say but it goes through various experiences the author Isabela went through on her own search for enlightenment.
Among the seminars she went to is an NLP seminar and no one is spared her brilliant wit.
Hilariously funny and enjoyable to read, this is a great holiday book which will open your mind to looking at the world of personal development in a different way.