Imagine that you are selflessly helping a person and asking him to thank three other people instead of you, who, in turn, will help three more. And so warmth and kindness will spread throughout the planet. How effective can such a seemingly simple idea be? Twelve-year-old Trevor decides to test this and begins a chain of good deeds, albeit naively, but sincerely and trying his best to change the world for the better.

The first edition of the book was published in 1999. And already in 2000 the book was filmed.