This book "Out of Series #4" is the continuation of The Mysterious Cities Of Gold (Out Series #1-2-3) which the three childrens (becoming parents) will must to save the world for the last time. During the last adventure, there will have a lot of unexpected surprise which the Mendoza's group will be "speechless". Then, it's up to you to find out in this book and I wrote the srcript with the sotry. Good reading.