What happened to the son of Madame Butterfly?

I loved the idea of this book - what happened to the son of Madame Butterfly? A classic tale of love and the fruit of that love Ben "Trouble" Pinkerton has his tale related by author David Rain in a book that starts off so well you know it's  going to be a great read - and then it's such a disappointment.

I really had to struggle to stay with it and ended up wishing for a different story for the offspring of such a spellbinding love story.